31690801 has 2 divisors, whose sum is σ = 31690802. Its totient is φ = 31690800.

The previous prime is 31690783. The next prime is 31690859. The reversal of 31690801 is 10809613.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31640625 + 50176 = 5625^2 + 224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31690801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31690801.

It is not a weakly prime, because it can be changed into another prime (31690861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15845400 + 15845401.

It is an arithmetic number, because the mean of its divisors is an integer number (15845401).

Almost surely, 2^31690801 is an apocalyptic number.

It is an amenable number.

31690801 is a deficient number, since it is larger than the sum of its proper divisors (1).

31690801 is an equidigital number, since it uses as much as digits as its factorization.

31690801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 31690801 is about 5629.4583220768. The cubic root of 31690801 is about 316.4543516178.

The spelling of 31690801 in words is "thirty-one million, six hundred ninety thousand, eight hundred one".