136307491 has 2 divisors, whose sum is σ = 136307492. Its totient is φ = 136307490.

The previous prime is 136307471. The next prime is 136307503. The reversal of 136307491 is 194703631.

136307491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (194703631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136307491 - 2⁵ = 136307459 is a prime.

It is equal to p_7715086 and since 136307491 and 7715086 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (136307461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68153745 + 68153746.

It is an arithmetic number, because the mean of its divisors is an integer number (68153746).

Almost surely, 2^136307491 is an apocalyptic number.

136307491 is a deficient number, since it is larger than the sum of its proper divisors (1).

136307491 is an equidigital number, since it uses as much as digits as its factorization.

136307491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 136307491 is about 11675.0799140734. The cubic root of 136307491 is about 514.6435979459.

The spelling of 136307491 in words is "one hundred thirty-six million, three hundred seven thousand, four hundred ninety-one".