31949521 has 2 divisors, whose sum is σ = 31949522. Its totient is φ = 31949520.

The previous prime is 31949509. The next prime is 31949549. The reversal of 31949521 is 12594913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25897921 + 6051600 = 5089^2 + 2460^2 .

It is a cyclic number.

It is not a de Polignac number, because 31949521 - 2²¹ = 29852369 is a prime.

It is not a weakly prime, because it can be changed into another prime (31949501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15974760 + 15974761.

It is an arithmetic number, because the mean of its divisors is an integer number (15974761).

Almost surely, 2^31949521 is an apocalyptic number.

It is an amenable number.

31949521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31949521 is an equidigital number, since it uses as much as digits as its factorization.

31949521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 31949521 is about 5652.3907331323. The cubic root of 31949521 is about 317.3131841664.

The spelling of 31949521 in words is "thirty-one million, nine hundred forty-nine thousand, five hundred twenty-one".