131981851 has 4 divisors (see below), whose sum is σ = 133288704. Its totient is φ = 130675000.

The previous prime is 131981821. The next prime is 131981867. The reversal of 131981851 is 158189131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131981851 - 2⁷ = 131981723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131981851.

It is not an unprimeable number, because it can be changed into a prime (131981821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653275 + ... + 653476.

It is an arithmetic number, because the mean of its divisors is an integer number (33322176).

Almost surely, 2^131981851 is an apocalyptic number.

131981851 is a deficient number, since it is larger than the sum of its proper divisors (1306853).

131981851 is a wasteful number, since it uses less digits than its factorization.

131981851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306852.

The product of its digits is 8640, while the sum is 37.

The square root of 131981851 is about 11488.3354320807. The cubic root of 131981851 is about 509.1410004834.

The spelling of 131981851 in words is "one hundred thirty-one million, nine hundred eighty-one thousand, eight hundred fifty-one".