136644631 has 2 divisors, whose sum is σ = 136644632. Its totient is φ = 136644630.

The previous prime is 136644611. The next prime is 136644661. The reversal of 136644631 is 136446631.

It is a weak prime.

It is an emirp because it is prime and its reverse (136446631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136644631 - 2⁷ = 136644503 is a prime.

It is a super-2 number, since 2×136644631² = 37343510362252322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136644601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68322315 + 68322316.

It is an arithmetic number, because the mean of its divisors is an integer number (68322316).

Almost surely, 2^136644631 is an apocalyptic number.

136644631 is a deficient number, since it is larger than the sum of its proper divisors (1).

136644631 is an equidigital number, since it uses as much as digits as its factorization.

136644631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 34.

The square root of 136644631 is about 11689.5094422307. The cubic root of 136644631 is about 515.0675513866.

The spelling of 136644631 in words is "one hundred thirty-six million, six hundred forty-four thousand, six hundred thirty-one".