131370721 has 2 divisors, whose sum is σ = 131370722. Its totient is φ = 131370720.

The previous prime is 131370697. The next prime is 131370737. The reversal of 131370721 is 127073131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 59120721 = 8500^2 + 7689^2 .

It is a cyclic number.

It is not a de Polignac number, because 131370721 - 2⁹ = 131370209 is a prime.

It is not a weakly prime, because it can be changed into another prime (131370751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65685360 + 65685361.

It is an arithmetic number, because the mean of its divisors is an integer number (65685361).

Almost surely, 2^131370721 is an apocalyptic number.

It is an amenable number.

131370721 is a deficient number, since it is larger than the sum of its proper divisors (1).

131370721 is an equidigital number, since it uses as much as digits as its factorization.

131370721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 25.

The square root of 131370721 is about 11461.7067228227. The cubic root of 131370721 is about 508.3539406737.

The spelling of 131370721 in words is "one hundred thirty-one million, three hundred seventy thousand, seven hundred twenty-one".