131794921 has 2 divisors, whose sum is σ = 131794922. Its totient is φ = 131794920.

The previous prime is 131794913. The next prime is 131794973. The reversal of 131794921 is 129497131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114062400 + 17732521 = 10680^2 + 4211^2 .

It is a cyclic number.

It is not a de Polignac number, because 131794921 - 2³ = 131794913 is a prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (131794021) 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 as a sum of consecutive naturals, namely, 65897460 + 65897461.

It is an arithmetic number, because the mean of its divisors is an integer number (65897461).

Almost surely, 2^131794921 is an apocalyptic number.

It is an amenable number.

131794921 is a deficient number, since it is larger than the sum of its proper divisors (1).

131794921 is an equidigital number, since it uses as much as digits as its factorization.

131794921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 131794921 is about 11480.1969059768. The cubic root of 131794921 is about 508.9005161683.

The spelling of 131794921 in words is "one hundred thirty-one million, seven hundred ninety-four thousand, nine hundred twenty-one".