131251551 has 8 divisors (see below), whose sum is σ = 180647424. Its totient is φ = 84678360.

The previous prime is 131251541. The next prime is 131251559. The reversal of 131251551 is 155152131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131251551 - 2²² = 127057247 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131251559) 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 in 7 ways as a sum of consecutive naturals, for example, 705561 + ... + 705746.

It is an arithmetic number, because the mean of its divisors is an integer number (22580928).

Almost surely, 2^131251551 is an apocalyptic number.

131251551 is a deficient number, since it is larger than the sum of its proper divisors (49395873).

131251551 is a wasteful number, since it uses less digits than its factorization.

131251551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411341.

The product of its digits is 750, while the sum is 24.

The square root of 131251551 is about 11456.5069283792. The cubic root of 131251551 is about 508.2001802164.

The spelling of 131251551 in words is "one hundred thirty-one million, two hundred fifty-one thousand, five hundred fifty-one".