1631253257 has 2 divisors, whose sum is σ = 1631253258. Its totient is φ = 1631253256.

The previous prime is 1631253229. The next prime is 1631253259. The reversal of 1631253257 is 7523521361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1558986256 + 72267001 = 39484^2 + 8501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631253257 - 2⁶ = 1631253193 is a prime.

Together with 1631253259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1631253259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815626628 + 815626629.

It is an arithmetic number, because the mean of its divisors is an integer number (815626629).

Almost surely, 2^1631253257 is an apocalyptic number.

It is an amenable number.

1631253257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631253257 is an equidigital number, since it uses as much as digits as its factorization.

1631253257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 35.

The square root of 1631253257 is about 40388.7763741364. The cubic root of 1631253257 is about 1177.1734648705.

The spelling of 1631253257 in words is "one billion, six hundred thirty-one million, two hundred fifty-three thousand, two hundred fifty-seven".