136769261 has 4 divisors (see below), whose sum is σ = 137161500. Its totient is φ = 136377024.

The previous prime is 136769141. The next prime is 136769263. The reversal of 136769261 is 162967631.

136769261 = 8269² + 8270².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162967631 = 139 ⋅1172429.

It can be written as a sum of positive squares in 2 ways, for example, as 68392900 + 68376361 = 8270^2 + 8269^2 .

It is a cyclic number.

It is not a de Polignac number, because 136769261 - 2¹⁰ = 136768237 is a prime.

It is a super-2 number, since 2×136769261² = 37411661508972242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136769263) 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, 195596 + ... + 196293.

It is an arithmetic number, because the mean of its divisors is an integer number (34290375).

Almost surely, 2^136769261 is an apocalyptic number.

136769261 is the 8270-th centered square number.

It is an amenable number.

136769261 is a deficient number, since it is larger than the sum of its proper divisors (392239).

136769261 is an equidigital number, since it uses as much as digits as its factorization.

136769261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392238.

The product of its digits is 81648, while the sum is 41.

The square root of 136769261 is about 11694.8390754213. The cubic root of 136769261 is about 515.2240970241.

The spelling of 136769261 in words is "one hundred thirty-six million, seven hundred sixty-nine thousand, two hundred sixty-one".