136569497 has 4 divisors (see below), whose sum is σ = 141278820. Its totient is φ = 131860176.

The previous prime is 136569493. The next prime is 136569509. The reversal of 136569497 is 794965631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 794965631 = 4877 ⋅163003.

It can be written as a sum of positive squares in 2 ways, for example, as 106275481 + 30294016 = 10309^2 + 5504^2 .

It is a cyclic number.

It is not a de Polignac number, because 136569497 - 2² = 136569493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136569491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2354618 + ... + 2354675.

It is an arithmetic number, because the mean of its divisors is an integer number (35319705).

Almost surely, 2^136569497 is an apocalyptic number.

It is an amenable number.

136569497 is a deficient number, since it is larger than the sum of its proper divisors (4709323).

136569497 is an equidigital number, since it uses as much as digits as its factorization.

136569497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709322.

The product of its digits is 1224720, while the sum is 50.

The square root of 136569497 is about 11686.2952641117. The cubic root of 136569497 is about 514.9731308444.

The spelling of 136569497 in words is "one hundred thirty-six million, five hundred sixty-nine thousand, four hundred ninety-seven".