149636591 has 4 divisors (see below), whose sum is σ = 161147112. Its totient is φ = 138126072.

The previous prime is 149636587. The next prime is 149636629. The reversal of 149636591 is 195636941.

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 149636591 - 2² = 149636587 is a prime.

It is a super-2 number, since 2×149636591² = 44782218732202562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149636581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5755241 + ... + 5755266.

It is an arithmetic number, because the mean of its divisors is an integer number (40286778).

Almost surely, 2^149636591 is an apocalyptic number.

149636591 is a deficient number, since it is larger than the sum of its proper divisors (11510521).

149636591 is a wasteful number, since it uses less digits than its factorization.

149636591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11510520.

The product of its digits is 174960, while the sum is 44.

The square root of 149636591 is about 12232.6036067552. The cubic root of 149636591 is about 530.8998490605.

The spelling of 149636591 in words is "one hundred forty-nine million, six hundred thirty-six thousand, five hundred ninety-one".