131409823 has 2 divisors, whose sum is σ = 131409824. Its totient is φ = 131409822.

The previous prime is 131409793. The next prime is 131409869. The reversal of 131409823 is 328904131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131409823 - 2²⁵ = 97855391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131409023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65704911 + 65704912.

It is an arithmetic number, because the mean of its divisors is an integer number (65704912).

Almost surely, 2^131409823 is an apocalyptic number.

131409823 is a deficient number, since it is larger than the sum of its proper divisors (1).

131409823 is an equidigital number, since it uses as much as digits as its factorization.

131409823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 131409823 is about 11463.4123628176. The cubic root of 131409823 is about 508.4043722153.

The spelling of 131409823 in words is "one hundred thirty-one million, four hundred nine thousand, eight hundred twenty-three".