131553971 has 2 divisors, whose sum is σ = 131553972. Its totient is φ = 131553970.

The previous prime is 131553959. The next prime is 131553977. The reversal of 131553971 is 179355131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131553971 - 2²² = 127359667 is a prime.

It is not a weakly prime, because it can be changed into another prime (131553977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65776985 + 65776986.

It is an arithmetic number, because the mean of its divisors is an integer number (65776986).

Almost surely, 2^131553971 is an apocalyptic number.

131553971 is a deficient number, since it is larger than the sum of its proper divisors (1).

131553971 is an equidigital number, since it uses as much as digits as its factorization.

131553971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14175, while the sum is 35.

The square root of 131553971 is about 11469.6979471998. The cubic root of 131553971 is about 508.5901997576.

The spelling of 131553971 in words is "one hundred thirty-one million, five hundred fifty-three thousand, nine hundred seventy-one".