149538591 has 6 divisors (see below), whose sum is σ = 216000200. Its totient is φ = 99692388.

The previous prime is 149538559. The next prime is 149538611. The reversal of 149538591 is 195835941.

149538591 is a `hidden beast` number, since 1 + 4 + 9 + 53 + 8 + 591 = 666.

It is not a de Polignac number, because 149538591 - 2⁵ = 149538559 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 (149538541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8307691 + ... + 8307708.

Almost surely, 2^149538591 is an apocalyptic number.

149538591 is a deficient number, since it is larger than the sum of its proper divisors (66461609).

149538591 is a wasteful number, since it uses less digits than its factorization.

149538591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16615405 (or 16615402 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 149538591 is about 12228.5972621556. The cubic root of 149538591 is about 530.7839247689.

The spelling of 149538591 in words is "one hundred forty-nine million, five hundred thirty-eight thousand, five hundred ninety-one".