30631703257 has 2 divisors, whose sum is σ = 30631703258. Its totient is φ = 30631703256.

The previous prime is 30631703197. The next prime is 30631703279. The reversal of 30631703257 is 75230713603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24755560921 + 5876142336 = 157339^2 + 76656^2 .

It is a cyclic number.

It is not a de Polignac number, because 30631703257 - 2⁷ = 30631703129 is a prime.

It is not a weakly prime, because it can be changed into another prime (30631703287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15315851628 + 15315851629.

It is an arithmetic number, because the mean of its divisors is an integer number (15315851629).

Almost surely, 2^30631703257 is an apocalyptic number.

It is an amenable number.

30631703257 is a deficient number, since it is larger than the sum of its proper divisors (1).

30631703257 is an equidigital number, since it uses as much as digits as its factorization.

30631703257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 37.

The spelling of 30631703257 in words is "thirty billion, six hundred thirty-one million, seven hundred three thousand, two hundred fifty-seven".