31442491 has 2 divisors, whose sum is σ = 31442492. Its totient is φ = 31442490.

The previous prime is 31442479. The next prime is 31442513. The reversal of 31442491 is 19424413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31442491 - 2¹⁵ = 31409723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31442431) 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, 15721245 + 15721246.

It is an arithmetic number, because the mean of its divisors is an integer number (15721246).

Almost surely, 2^31442491 is an apocalyptic number.

31442491 is a deficient number, since it is larger than the sum of its proper divisors (1).

31442491 is an equidigital number, since it uses as much as digits as its factorization.

31442491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 31442491 is about 5607.3604307196. The cubic root of 31442491 is about 315.6256683448.

The spelling of 31442491 in words is "thirty-one million, four hundred forty-two thousand, four hundred ninety-one".