131317551 has 16 divisors (see below), whose sum is σ = 199804000. Its totient is φ = 85178304.

The previous prime is 131317541. The next prime is 131317559. The reversal of 131317551 is 155713131.

It is not a de Polignac number, because 131317551 - 2¹⁷ = 131186479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131317559) 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, 64726 + ... + 66723.

It is an arithmetic number, because the mean of its divisors is an integer number (12487750).

Almost surely, 2^131317551 is an apocalyptic number.

131317551 is a deficient number, since it is larger than the sum of its proper divisors (68486449).

131317551 is a wasteful number, since it uses less digits than its factorization.

131317551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131495 (or 131489 counting only the distinct ones).

The product of its digits is 1575, while the sum is 27.

The square root of 131317551 is about 11459.3870254914. The cubic root of 131317551 is about 508.2853489658.

The spelling of 131317551 in words is "one hundred thirty-one million, three hundred seventeen thousand, five hundred fifty-one".