131912921 has 16 divisors (see below), whose sum is σ = 152505600. Its totient is φ = 111767040.

The previous prime is 131912899. The next prime is 131912933. The reversal of 131912921 is 129219131.

It is a de Polignac number, because none of the positive numbers 2^k-131912921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131912941) 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 15 ways as a sum of consecutive naturals, for example, 391265 + ... + 391601.

It is an arithmetic number, because the mean of its divisors is an integer number (9531600).

Almost surely, 2^131912921 is an apocalyptic number.

It is an amenable number.

131912921 is a deficient number, since it is larger than the sum of its proper divisors (20592679).

131912921 is a wasteful number, since it uses less digits than its factorization.

131912921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824.

The product of its digits is 972, while the sum is 29.

The square root of 131912921 is about 11485.3350408249. The cubic root of 131912921 is about 509.0523488989.

The spelling of 131912921 in words is "one hundred thirty-one million, nine hundred twelve thousand, nine hundred twenty-one".