131979949 has 2 divisors, whose sum is σ = 131979950. Its totient is φ = 131979948.

The previous prime is 131979937. The next prime is 131979971. The reversal of 131979949 is 949979131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118657449 + 13322500 = 10893^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 131979949 - 2⁵ = 131979917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131979896 and 131979905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131979929) 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, 65989974 + 65989975.

It is an arithmetic number, because the mean of its divisors is an integer number (65989975).

Almost surely, 2^131979949 is an apocalyptic number.

It is an amenable number.

131979949 is a deficient number, since it is larger than the sum of its proper divisors (1).

131979949 is an equidigital number, since it uses as much as digits as its factorization.

131979949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 52.

The square root of 131979949 is about 11488.2526521660. The cubic root of 131979949 is about 509.1385547157.

The spelling of 131979949 in words is "one hundred thirty-one million, nine hundred seventy-nine thousand, nine hundred forty-nine".