31283911657 has 2 divisors, whose sum is σ = 31283911658. Its totient is φ = 31283911656.

The previous prime is 31283911643. The next prime is 31283911661. The reversal of 31283911657 is 75611938213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30759547456 + 524364201 = 175384^2 + 22899^2 .

It is a cyclic number.

It is not a de Polignac number, because 31283911657 - 2¹⁵ = 31283878889 is a prime.

It is not a weakly prime, because it can be changed into another prime (31283911957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15641955828 + 15641955829.

It is an arithmetic number, because the mean of its divisors is an integer number (15641955829).

Almost surely, 2^31283911657 is an apocalyptic number.

It is an amenable number.

31283911657 is a deficient number, since it is larger than the sum of its proper divisors (1).

31283911657 is an equidigital number, since it uses as much as digits as its factorization.

31283911657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The spelling of 31283911657 in words is "thirty-one billion, two hundred eighty-three million, nine hundred eleven thousand, six hundred fifty-seven".