31104487 has 4 divisors (see below), whose sum is σ = 32456880. Its totient is φ = 29752096.

The previous prime is 31104473. The next prime is 31104511. The reversal of 31104487 is 78440113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78440113 = 19 ⋅4128427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31104487 is a prime.

It is a super-2 number, since 2×31104487² = 1934978223066338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31104427) 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, 676162 + ... + 676207.

It is an arithmetic number, because the mean of its divisors is an integer number (8114220).

Almost surely, 2^31104487 is an apocalyptic number.

31104487 is a deficient number, since it is larger than the sum of its proper divisors (1352393).

31104487 is a wasteful number, since it uses less digits than its factorization.

31104487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352392.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 31104487 is about 5577.1396790828. The cubic root of 31104487 is about 314.4906086302.

The spelling of 31104487 in words is "thirty-one million, one hundred four thousand, four hundred eighty-seven".