31104431 has 2 divisors, whose sum is σ = 31104432. Its totient is φ = 31104430.

The previous prime is 31104427. The next prime is 31104473. The reversal of 31104431 is 13440113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31104431 - 2² = 31104427 is a prime.

It is a super-2 number, since 2×31104431² = 1934971255667522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31104331) 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 as a sum of consecutive naturals, namely, 15552215 + 15552216.

It is an arithmetic number, because the mean of its divisors is an integer number (15552216).

Almost surely, 2^31104431 is an apocalyptic number.

31104431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31104431 is an equidigital number, since it uses as much as digits as its factorization.

31104431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 31104431 is about 5577.1346585859. The cubic root of 31104431 is about 314.4904198955.

Adding to 31104431 its reverse (13440113), we get a palindrome (44544544).

The spelling of 31104431 in words is "thirty-one million, one hundred four thousand, four hundred thirty-one".