31496809 has 2 divisors, whose sum is σ = 31496810. Its totient is φ = 31496808.

The previous prime is 31496791. The next prime is 31496819. The reversal of 31496809 is 90869413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19386409 + 12110400 = 4403^2 + 3480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31496809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31496819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15748404 + 15748405.

It is an arithmetic number, because the mean of its divisors is an integer number (15748405).

Almost surely, 2^31496809 is an apocalyptic number.

It is an amenable number.

31496809 is a deficient number, since it is larger than the sum of its proper divisors (1).

31496809 is an equidigital number, since it uses as much as digits as its factorization.

31496809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 31496809 is about 5612.2017960868. The cubic root of 31496809 is about 315.8073152351.

The spelling of 31496809 in words is "thirty-one million, four hundred ninety-six thousand, eight hundred nine".