31299031 has 4 divisors (see below), whose sum is σ = 32062464. Its totient is φ = 30535600.

The previous prime is 31299017. The next prime is 31299041. The reversal of 31299031 is 13099213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31299031 - 2⁵ = 31298999 is a prime.

It is a super-2 number, since 2×31299031² = 1959258683077922, 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 (31299041) 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, 381655 + ... + 381736.

It is an arithmetic number, because the mean of its divisors is an integer number (8015616).

Almost surely, 2^31299031 is an apocalyptic number.

31299031 is a deficient number, since it is larger than the sum of its proper divisors (763433).

31299031 is an equidigital number, since it uses as much as digits as its factorization.

31299031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763432.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 31299031 is about 5594.5536908676. The cubic root of 31299031 is about 315.1449102307.

The spelling of 31299031 in words is "thirty-one million, two hundred ninety-nine thousand, thirty-one".