131146921 has 4 divisors (see below), whose sum is σ = 131170432. Its totient is φ = 131123412.

The previous prime is 131146919. The next prime is 131146979. The reversal of 131146921 is 129641131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131146921 - 2¹ = 131146919 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 131146921.

It is not an unprimeable number, because it can be changed into a prime (131146901) 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 3 ways as a sum of consecutive naturals, for example, 1900 + ... + 16306.

It is an arithmetic number, because the mean of its divisors is an integer number (32792608).

Almost surely, 2^131146921 is an apocalyptic number.

It is an amenable number.

131146921 is a deficient number, since it is larger than the sum of its proper divisors (23511).

131146921 is an equidigital number, since it uses as much as digits as its factorization.

131146921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23510.

The product of its digits is 1296, while the sum is 28.

The square root of 131146921 is about 11451.9396173749. The cubic root of 131146921 is about 508.0651034115.

The spelling of 131146921 in words is "one hundred thirty-one million, one hundred forty-six thousand, nine hundred twenty-one".