31604231 has 8 divisors (see below), whose sum is σ = 33035904. Its totient is φ = 30177400.

The previous prime is 31604227. The next prime is 31604263. The reversal of 31604231 is 13240613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31604231 - 2² = 31604227 is a prime.

It is a super-2 number, since 2×31604231² = 1997654834202722, 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 (31604281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21056 + ... + 22506.

It is an arithmetic number, because the mean of its divisors is an integer number (4129488).

Almost surely, 2^31604231 is an apocalyptic number.

31604231 is a deficient number, since it is larger than the sum of its proper divisors (1431673).

31604231 is a wasteful number, since it uses less digits than its factorization.

31604231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31604231 is about 5621.7640469874. The cubic root of 31604231 is about 316.1659352558.

Adding to 31604231 its reverse (13240613), we get a palindrome (44844844).

The spelling of 31604231 in words is "thirty-one million, six hundred four thousand, two hundred thirty-one".