131981555 has 8 divisors (see below), whose sum is σ = 159129744. Its totient is φ = 105084000.

The previous prime is 131981461. The next prime is 131981561. The reversal of 131981555 is 555189131.

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

It is not a de Polignac number, because 131981555 - 2¹⁰ = 131980531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61496 + ... + 63605.

It is an arithmetic number, because the mean of its divisors is an integer number (19891218).

Almost surely, 2^131981555 is an apocalyptic number.

131981555 is a deficient number, since it is larger than the sum of its proper divisors (27148189).

131981555 is a wasteful number, since it uses less digits than its factorization.

131981555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125317.

The product of its digits is 27000, while the sum is 38.

The square root of 131981555 is about 11488.3225494412. The cubic root of 131981555 is about 509.1406198607.

The spelling of 131981555 in words is "one hundred thirty-one million, nine hundred eighty-one thousand, five hundred fifty-five".