136261421 has 2 divisors, whose sum is σ = 136261422. Its totient is φ = 136261420.

The previous prime is 136261381. The next prime is 136261427. The reversal of 136261421 is 124162631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115885225 + 20376196 = 10765^2 + 4514^2 .

It is an emirp because it is prime and its reverse (124162631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136261421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136261427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68130710 + 68130711.

It is an arithmetic number, because the mean of its divisors is an integer number (68130711).

Almost surely, 2^136261421 is an apocalyptic number.

It is an amenable number.

136261421 is a deficient number, since it is larger than the sum of its proper divisors (1).

136261421 is an equidigital number, since it uses as much as digits as its factorization.

136261421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 136261421 is about 11673.1067415663. The cubic root of 136261421 is about 514.5856106652.

The spelling of 136261421 in words is "one hundred thirty-six million, two hundred sixty-one thousand, four hundred twenty-one".