136642431 has 4 divisors (see below), whose sum is σ = 182189912. Its totient is φ = 91094952.

The previous prime is 136642399. The next prime is 136642459. The reversal of 136642431 is 134246631.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 136642431 - 2⁵ = 136642399 is a prime.

It is a super-2 number, since 2×136642431² = 37342307899179522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136642631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22773736 + ... + 22773741.

It is an arithmetic number, because the mean of its divisors is an integer number (45547478).

Almost surely, 2^136642431 is an apocalyptic number.

136642431 is a deficient number, since it is larger than the sum of its proper divisors (45547481).

136642431 is an equidigital number, since it uses as much as digits as its factorization.

136642431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45547480.

The product of its digits is 10368, while the sum is 30.

The square root of 136642431 is about 11689.4153403838. The cubic root of 136642431 is about 515.0647871490.

The spelling of 136642431 in words is "one hundred thirty-six million, six hundred forty-two thousand, four hundred thirty-one".