1312137657 has 16 divisors (see below), whose sum is σ = 1956960000. Its totient is φ = 868884912.

The previous prime is 1312137601. The next prime is 1312137661. The reversal of 1312137657 is 7567312131.

It is not a de Polignac number, because 1312137657 - 2¹¹ = 1312135609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312137667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159057 + ... + 167102.

It is an arithmetic number, because the mean of its divisors is an integer number (122310000).

Almost surely, 2^1312137657 is an apocalyptic number.

It is an amenable number.

1312137657 is a deficient number, since it is larger than the sum of its proper divisors (644822343).

1312137657 is a wasteful number, since it uses less digits than its factorization.

1312137657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326317 (or 326311 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 1312137657 is about 36223.4407117822. The cubic root of 1312137657 is about 1094.7790208985.

Adding to 1312137657 its reverse (7567312131), we get a palindrome (8879449788).

The spelling of 1312137657 in words is "one billion, three hundred twelve million, one hundred thirty-seven thousand, six hundred fifty-seven".