136424621 has 2 divisors, whose sum is σ = 136424622. Its totient is φ = 136424620.

The previous prime is 136424599. The next prime is 136424627. The reversal of 136424621 is 126424631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133148521 + 3276100 = 11539^2 + 1810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136424621 is a prime.

It is a super-2 number, since 2×136424621² = 37223354429987282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_7721417 and since 136424621 and 7721417 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 (136424627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68212310 + 68212311.

It is an arithmetic number, because the mean of its divisors is an integer number (68212311).

Almost surely, 2^136424621 is an apocalyptic number.

It is an amenable number.

136424621 is a deficient number, since it is larger than the sum of its proper divisors (1).

136424621 is an equidigital number, since it uses as much as digits as its factorization.

136424621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 136424621 is about 11680.0950766678. The cubic root of 136424621 is about 514.7909680477.

The spelling of 136424621 in words is "one hundred thirty-six million, four hundred twenty-four thousand, six hundred twenty-one".