631251097 has 2 divisors, whose sum is σ = 631251098. Its totient is φ = 631251096.

The previous prime is 631251013. The next prime is 631251107. The reversal of 631251097 is 790152136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631215376 + 35721 = 25124^2 + 189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631251097 is a prime.

It is not a weakly prime, because it can be changed into another prime (631258097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315625548 + 315625549.

It is an arithmetic number, because the mean of its divisors is an integer number (315625549).

Almost surely, 2^631251097 is an apocalyptic number.

It is an amenable number.

631251097 is a deficient number, since it is larger than the sum of its proper divisors (1).

631251097 is an equidigital number, since it uses as much as digits as its factorization.

631251097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 631251097 is about 25124.7108839087. The cubic root of 631251097 is about 857.8289827282.

The spelling of 631251097 in words is "six hundred thirty-one million, two hundred fifty-one thousand, ninety-seven".