131980021 has 2 divisors, whose sum is σ = 131980022. Its totient is φ = 131980020.

The previous prime is 131979973. The next prime is 131980031. The reversal of 131980021 is 120089131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118919025 + 13060996 = 10905^2 + 3614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131980021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131980031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65990010 + 65990011.

It is an arithmetic number, because the mean of its divisors is an integer number (65990011).

Almost surely, 2^131980021 is an apocalyptic number.

It is an amenable number.

131980021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131980021 is an equidigital number, since it uses as much as digits as its factorization.

131980021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 131980021 is about 11488.2557858014. The cubic root of 131980021 is about 509.1386473004.

The spelling of 131980021 in words is "one hundred thirty-one million, nine hundred eighty thousand, twenty-one".