131000399 has 2 divisors, whose sum is σ = 131000400. Its totient is φ = 131000398.

The previous prime is 131000381. The next prime is 131000423. The reversal of 131000399 is 993000131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131000399 - 2²⁰ = 129951823 is a prime.

It is a super-2 number, since 2×131000399² = 34322209076318402, which contains 22 as substring.

It is equal to p_7431722 and since 131000399 and 7431722 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331000399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65500199 + 65500200.

It is an arithmetic number, because the mean of its divisors is an integer number (65500200).

Almost surely, 2^131000399 is an apocalyptic number.

131000399 is a deficient number, since it is larger than the sum of its proper divisors (1).

131000399 is an equidigital number, since it uses as much as digits as its factorization.

131000399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 131000399 is about 11445.5405726423. The cubic root of 131000399 is about 507.8758234419.

The spelling of 131000399 in words is "one hundred thirty-one million, three hundred ninety-nine", and thus it is an aban number.