31023081 has 24 divisors (see below), whose sum is σ = 47567520. Its totient is φ = 20194272.

The previous prime is 31023071. The next prime is 31023103. The reversal of 31023081 is 18032013.

It is not a de Polignac number, because 31023081 - 2¹¹ = 31021033 is a prime.

It is a super-2 number, since 2×31023081² = 1924863109465122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023061) 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 23 ways as a sum of consecutive naturals, for example, 8965 + ... + 11933.

It is an arithmetic number, because the mean of its divisors is an integer number (1981980).

Almost surely, 2^31023081 is an apocalyptic number.

It is an amenable number.

31023081 is a deficient number, since it is larger than the sum of its proper divisors (16544439).

31023081 is an equidigital number, since it uses as much as digits as its factorization.

31023081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027 (or 3015 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 31023081 is about 5569.8367121488. The cubic root of 31023081 is about 314.2160095612.

Adding to 31023081 its reverse (18032013), we get a palindrome (49055094).

The spelling of 31023081 in words is "thirty-one million, twenty-three thousand, eighty-one".