136457991 has 12 divisors (see below), whose sum is σ = 197266680. Its totient is φ = 90897840.

The previous prime is 136457983. The next prime is 136458013. The reversal of 136457991 is 199754631.

136457991 is a `hidden beast` number, since 13 + 64 + 579 + 9 + 1 = 666.

It is not a de Polignac number, because 136457991 - 2³ = 136457983 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136457911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6940 + ... + 17918.

It is an arithmetic number, because the mean of its divisors is an integer number (16438890).

Almost surely, 2^136457991 is an apocalyptic number.

136457991 is a deficient number, since it is larger than the sum of its proper divisors (60808689).

136457991 is a wasteful number, since it uses less digits than its factorization.

136457991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12366 (or 12363 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 136457991 is about 11681.5234879702. The cubic root of 136457991 is about 514.8329379258.

The spelling of 136457991 in words is "one hundred thirty-six million, four hundred fifty-seven thousand, nine hundred ninety-one".