131980721 has 2 divisors, whose sum is σ = 131980722. Its totient is φ = 131980720.

The previous prime is 131980703. The next prime is 131980777. The reversal of 131980721 is 127089131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123454321 + 8526400 = 11111^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 131980721 - 2⁶ = 131980657 is a prime.

It is equal to p_7484171 and since 131980721 and 7484171 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (131980021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65990360 + 65990361.

It is an arithmetic number, because the mean of its divisors is an integer number (65990361).

Almost surely, 2^131980721 is an apocalyptic number.

It is an amenable number.

131980721 is a deficient number, since it is larger than the sum of its proper divisors (1).

131980721 is an equidigital number, since it uses as much as digits as its factorization.

131980721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 131980721 is about 11488.2862516565. The cubic root of 131980721 is about 509.1395474276.

The spelling of 131980721 in words is "one hundred thirty-one million, nine hundred eighty thousand, seven hundred twenty-one".