31875997 has 2 divisors, whose sum is σ = 31875998. Its totient is φ = 31875996.

The previous prime is 31875937. The next prime is 31876001. The reversal of 31875997 is 79957813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 4218916 = 5259^2 + 2054^2 .

It is a cyclic number.

It is not a de Polignac number, because 31875997 - 2¹¹ = 31873949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31875997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31875937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15937998 + 15937999.

It is an arithmetic number, because the mean of its divisors is an integer number (15937999).

Almost surely, 2^31875997 is an apocalyptic number.

It is an amenable number.

31875997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31875997 is an equidigital number, since it uses as much as digits as its factorization.

31875997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 31875997 is about 5645.8831904318. The cubic root of 31875997 is about 317.0695910135.

The spelling of 31875997 in words is "thirty-one million, eight hundred seventy-five thousand, nine hundred ninety-seven".