136818631 has 2 divisors, whose sum is σ = 136818632. Its totient is φ = 136818630.

The previous prime is 136818629. The next prime is 136818659.

136818631 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 136818631 - 2¹ = 136818629 is a prime.

It is a super-2 number, since 2×136818631² = 37438675577428322, which contains 22 as substring.

Together with 136818629, it forms a pair of twin primes.

It is equal to p_7742584 and since 136818631 and 7742584 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 (136812631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68409315 + 68409316.

It is an arithmetic number, because the mean of its divisors is an integer number (68409316).

Almost surely, 2^136818631 is an apocalyptic number.

136818631 is a deficient number, since it is larger than the sum of its proper divisors (1).

136818631 is an equidigital number, since it uses as much as digits as its factorization.

136818631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 136818631 is about 11696.9496450998. The cubic root of 136818631 is about 515.2860835491.

The spelling of 136818631 in words is "one hundred thirty-six million, eight hundred eighteen thousand, six hundred thirty-one".