136653991 has 2 divisors, whose sum is σ = 136653992. Its totient is φ = 136653990.

The previous prime is 136653977. The next prime is 136653997. The reversal of 136653991 is 199356631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136653991 - 2⁹ = 136653479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136653997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68326995 + 68326996.

It is an arithmetic number, because the mean of its divisors is an integer number (68326996).

Almost surely, 2^136653991 is an apocalyptic number.

136653991 is a deficient number, since it is larger than the sum of its proper divisors (1).

136653991 is an equidigital number, since it uses as much as digits as its factorization.

136653991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 136653991 is about 11689.9097943483. The cubic root of 136653991 is about 515.0793116297.

The spelling of 136653991 in words is "one hundred thirty-six million, six hundred fifty-three thousand, nine hundred ninety-one".