31496921 has 2 divisors, whose sum is σ = 31496922. Its totient is φ = 31496920.

The previous prime is 31496917. The next prime is 31496947. The reversal of 31496921 is 12969413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 1466521 = 5480^2 + 1211^2 .

It is a cyclic number.

It is not a de Polignac number, because 31496921 - 2² = 31496917 is a prime.

It is not a weakly prime, because it can be changed into another prime (31496221) 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, 15748460 + 15748461.

It is an arithmetic number, because the mean of its divisors is an integer number (15748461).

Almost surely, 2^31496921 is an apocalyptic number.

It is an amenable number.

31496921 is a deficient number, since it is larger than the sum of its proper divisors (1).

31496921 is an equidigital number, since it uses as much as digits as its factorization.

31496921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 35.

The square root of 31496921 is about 5612.2117743364. The cubic root of 31496921 is about 315.8076895628.

The spelling of 31496921 in words is "thirty-one million, four hundred ninety-six thousand, nine hundred twenty-one".