31252861 has 2 divisors, whose sum is σ = 31252862. Its totient is φ = 31252860.

The previous prime is 31252847. The next prime is 31252877. The reversal of 31252861 is 16825213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31248100 + 4761 = 5590^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 31252861 - 2⁵ = 31252829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31252811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15626430 + 15626431.

It is an arithmetic number, because the mean of its divisors is an integer number (15626431).

Almost surely, 2^31252861 is an apocalyptic number.

It is an amenable number.

31252861 is a deficient number, since it is larger than the sum of its proper divisors (1).

31252861 is an equidigital number, since it uses as much as digits as its factorization.

31252861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 31252861 is about 5590.4258335121. The cubic root of 31252861 is about 314.9898745381.

The spelling of 31252861 in words is "thirty-one million, two hundred fifty-two thousand, eight hundred sixty-one".