136257561 has 12 divisors (see below), whose sum is σ = 214709040. Its totient is φ = 82580280.

The previous prime is 136257551. The next prime is 136257587. The reversal of 136257561 is 165752631.

It is not a de Polignac number, because 136257561 - 2¹³ = 136249369 is a prime.

It is a super-2 number, since 2×136257561² = 37132245859337442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136257551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 688071 + ... + 688268.

It is an arithmetic number, because the mean of its divisors is an integer number (17892420).

Almost surely, 2^136257561 is an apocalyptic number.

136257561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136257561 is a deficient number, since it is larger than the sum of its proper divisors (78451479).

136257561 is a wasteful number, since it uses less digits than its factorization.

136257561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376356 (or 1376353 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 136257561 is about 11672.9414030912. The cubic root of 136257561 is about 514.5807515760.

The spelling of 136257561 in words is "one hundred thirty-six million, two hundred fifty-seven thousand, five hundred sixty-one".