31249997 has 2 divisors, whose sum is σ = 31249998. Its totient is φ = 31249996.

The previous prime is 31249993. The next prime is 31250017. The reversal of 31249997 is 79994213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22600516 + 8649481 = 4754^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 31249997 - 2² = 31249993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31249991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15624998 + 15624999.

It is an arithmetic number, because the mean of its divisors is an integer number (15624999).

Almost surely, 2^31249997 is an apocalyptic number.

It is an amenable number.

31249997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31249997 is an equidigital number, since it uses as much as digits as its factorization.

31249997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 31249997 is about 5590.1696754213. The cubic root of 31249997 is about 314.9802523943.

The spelling of 31249997 in words is "thirty-one million, two hundred forty-nine thousand, nine hundred ninety-seven".