136531787 has 6 divisors (see below), whose sum is σ = 158822748. Its totient is φ = 117027204.

The previous prime is 136531783. The next prime is 136531817. The reversal of 136531787 is 787135631.

It is not a de Polignac number, because 136531787 - 2² = 136531783 is a prime.

It is a super-2 number, since 2×136531787² = 37281857722826738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136531783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1393133 + ... + 1393230.

It is an arithmetic number, because the mean of its divisors is an integer number (26470458).

Almost surely, 2^136531787 is an apocalyptic number.

136531787 is a deficient number, since it is larger than the sum of its proper divisors (22290961).

136531787 is an equidigital number, since it uses as much as digits as its factorization.

136531787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786377 (or 2786370 counting only the distinct ones).

The product of its digits is 105840, while the sum is 41.

The square root of 136531787 is about 11684.6817243774. The cubic root of 136531787 is about 514.9257278130.

The spelling of 136531787 in words is "one hundred thirty-six million, five hundred thirty-one thousand, seven hundred eighty-seven".