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30747631 = 89345479
BaseRepresentation
bin111010101001…
…0101111101111
32010212010211011
41311102233233
530332411011
63015010051
7522231145
oct165225757
963763734
1030747631
11163a1172
12a369927
1364a7385
144125595
152a75621
hex1d52bef

30747631 has 4 divisors (see below), whose sum is σ = 31093200. Its totient is φ = 30402064.

The previous prime is 30747571. The next prime is 30747641. The reversal of 30747631 is 13674703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13674703 = 71953529.

It is a cyclic number.

It is not a de Polignac number, because 30747631 - 213 = 30739439 is a prime.

It is a super-2 number, since 2×307476312 = 1890833624224322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30747593 and 30747602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30747641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172651 + ... + 172828.

It is an arithmetic number, because the mean of its divisors is an integer number (7773300).

Almost surely, 230747631 is an apocalyptic number.

30747631 is a deficient number, since it is larger than the sum of its proper divisors (345569).

30747631 is an equidigital number, since it uses as much as digits as its factorization.

30747631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345568.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 30747631 is about 5545.0546435540. The cubic root of 30747631 is about 313.2832822071.

The spelling of 30747631 in words is "thirty million, seven hundred forty-seven thousand, six hundred thirty-one".

Divisors: 1 89 345479 30747631