136511551 has 4 divisors (see below), whose sum is σ = 148921704. Its totient is φ = 124101400.

The previous prime is 136511527. The next prime is 136511579. The reversal of 136511551 is 155115631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136511551 - 2⁷ = 136511423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136511051) 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, 6205060 + ... + 6205081.

It is an arithmetic number, because the mean of its divisors is an integer number (37230426).

Almost surely, 2^136511551 is an apocalyptic number.

136511551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

136511551 is a deficient number, since it is larger than the sum of its proper divisors (12410153).

136511551 is a wasteful number, since it uses less digits than its factorization.

136511551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12410152.

The product of its digits is 2250, while the sum is 28.

The square root of 136511551 is about 11683.8157722552. The cubic root of 136511551 is about 514.9002867244.

The spelling of 136511551 in words is "one hundred thirty-six million, five hundred eleven thousand, five hundred fifty-one".