136781491 has 12 divisors (see below), whose sum is σ = 173578680. Its totient is φ = 106582560.

The previous prime is 136781443. The next prime is 136781497. The reversal of 136781491 is 194187631.

136781491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 136781491 - 2¹⁵ = 136748723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136781497) 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, 126346 + ... + 127423.

It is an arithmetic number, because the mean of its divisors is an integer number (14464890).

Almost surely, 2^136781491 is an apocalyptic number.

136781491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

136781491 is a deficient number, since it is larger than the sum of its proper divisors (36797189).

136781491 is a wasteful number, since it uses less digits than its factorization.

136781491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253794 (or 253787 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 136781491 is about 11695.3619439503. The cubic root of 136781491 is about 515.2394537957.

The spelling of 136781491 in words is "one hundred thirty-six million, seven hundred eighty-one thousand, four hundred ninety-one".