131201999 has 2 divisors, whose sum is σ = 131202000. Its totient is φ = 131201998.

The previous prime is 131201969. The next prime is 131202007. The reversal of 131201999 is 999102131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131201999 - 2⁸ = 131201743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131201969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65600999 + 65601000.

It is an arithmetic number, because the mean of its divisors is an integer number (65601000).

Almost surely, 2^131201999 is an apocalyptic number.

131201999 is a deficient number, since it is larger than the sum of its proper divisors (1).

131201999 is an equidigital number, since it uses as much as digits as its factorization.

131201999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 131201999 is about 11454.3441104238. The cubic root of 131201999 is about 508.1362177848.

The spelling of 131201999 in words is "one hundred thirty-one million, two hundred one thousand, nine hundred ninety-nine".