131216657 has 16 divisors (see below), whose sum is σ = 154586880. Its totient is φ = 109804800.

The previous prime is 131216639. The next prime is 131216699. The reversal of 131216657 is 756612131.

It is a cyclic number.

It is not a de Polignac number, because 131216657 - 2⁶ = 131216593 is a prime.

It is a super-2 number, since 2×131216657² = 34435622148511298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131216627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60569 + ... + 62697.

It is an arithmetic number, because the mean of its divisors is an integer number (9661680).

Almost surely, 2^131216657 is an apocalyptic number.

It is an amenable number.

131216657 is a deficient number, since it is larger than the sum of its proper divisors (23370223).

131216657 is a wasteful number, since it uses less digits than its factorization.

131216657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584.

The product of its digits is 7560, while the sum is 32.

The square root of 131216657 is about 11454.9839371341. The cubic root of 131216657 is about 508.1551402183.

Adding to 131216657 its reverse (756612131), we get a palindrome (887828788).

The spelling of 131216657 in words is "one hundred thirty-one million, two hundred sixteen thousand, six hundred fifty-seven".