136553491 has 2 divisors, whose sum is σ = 136553492. Its totient is φ = 136553490.

The previous prime is 136553447. The next prime is 136553497. The reversal of 136553491 is 194355631.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (194355631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136553491 - 2⁷ = 136553363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136553491.

It is not a weakly prime, because it can be changed into another prime (136553497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68276745 + 68276746.

It is an arithmetic number, because the mean of its divisors is an integer number (68276746).

Almost surely, 2^136553491 is an apocalyptic number.

136553491 is a deficient number, since it is larger than the sum of its proper divisors (1).

136553491 is an equidigital number, since it uses as much as digits as its factorization.

136553491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 37.

The square root of 136553491 is about 11685.6104247917. The cubic root of 136553491 is about 514.9530117057.

The spelling of 136553491 in words is "one hundred thirty-six million, five hundred fifty-three thousand, four hundred ninety-one".