31021434 has 32 divisors (see below), whose sum is σ = 71936640. Its totient is φ = 9890496.

The previous prime is 31021427. The next prime is 31021493. The reversal of 31021434 is 43412013.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11247 + ... + 13730.

It is an arithmetic number, because the mean of its divisors is an integer number (2248020).

Almost surely, 2^31021434 is an apocalyptic number.

31021434 is an abundant number, since it is smaller than the sum of its proper divisors (40915206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31021434 is a wasteful number, since it uses less digits than its factorization.

31021434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25011 (or 25005 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31021434 is about 5569.6888602506. The cubic root of 31021434 is about 314.2104489387.

Adding to 31021434 its reverse (43412013), we get a palindrome (74433447).

The spelling of 31021434 in words is "thirty-one million, twenty-one thousand, four hundred thirty-four".