Base | Representation |
---|---|
bin | 110101111101111… |
… | …100100101111101 |
3 | 2100002201200102002 |
4 | 311331330211331 |
5 | 3323242301141 |
6 | 225502312045 |
7 | 31303016516 |
oct | 6575744575 |
9 | 2302650362 |
10 | 905431421 |
11 | 425102034 |
12 | 213288625 |
13 | 11577894b |
14 | 88371a0d |
15 | 54750e9b |
hex | 35f7c97d |
905431421 has 4 divisors (see below), whose sum is σ = 909385500. Its totient is φ = 901477344.
The previous prime is 905431411. The next prime is 905431433. The reversal of 905431421 is 124134509.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124134509 = 31 ⋅4004339.
It can be written as a sum of positive squares in 2 ways, for example, as 501984025 + 403447396 = 22405^2 + 20086^2 .
It is a cyclic number.
It is not a de Polignac number, because 905431421 - 218 = 905169277 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (905431411) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1976696 + ... + 1977153.
It is an arithmetic number, because the mean of its divisors is an integer number (227346375).
Almost surely, 2905431421 is an apocalyptic number.
It is an amenable number.
905431421 is a deficient number, since it is larger than the sum of its proper divisors (3954079).
905431421 is a wasteful number, since it uses less digits than its factorization.
905431421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3954078.
The product of its (nonzero) digits is 4320, while the sum is 29.
The square root of 905431421 is about 30090.3875182757. The cubic root of 905431421 is about 967.4277051834.
The spelling of 905431421 in words is "nine hundred five million, four hundred thirty-one thousand, four hundred twenty-one".
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