149725521 has 48 divisors (see below), whose sum is σ = 246654720. Its totient is φ = 87410400.

The previous prime is 149725489. The next prime is 149725549. The reversal of 149725521 is 125527941.

149725521 is a `hidden beast` number, since 14 + 97 + 2 + 552 + 1 = 666.

It is not a de Polignac number, because 149725521 - 2⁵ = 149725489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (149725571) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 347176 + ... + 347606.

It is an arithmetic number, because the mean of its divisors is an integer number (5138640).

Almost surely, 2^149725521 is an apocalyptic number.

149725521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

149725521 is a deficient number, since it is larger than the sum of its proper divisors (96929199).

149725521 is a wasteful number, since it uses less digits than its factorization.

149725521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 474 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 149725521 is about 12236.2380248179. The cubic root of 149725521 is about 531.0050006445.

The spelling of 149725521 in words is "one hundred forty-nine million, seven hundred twenty-five thousand, five hundred twenty-one".