149971521 has 32 divisors (see below), whose sum is σ = 238215168. Its totient is φ = 82120320.

The previous prime is 149971519. The next prime is 149971529. The reversal of 149971521 is 125179941.

It is not a de Polignac number, because 149971521 - 2¹ = 149971519 is a prime.

It is a super-2 number, since 2×149971521² = 44982914222106882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 149971521.

It is not an unprimeable number, because it can be changed into a prime (149971529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68581 + ... + 70733.

It is an arithmetic number, because the mean of its divisors is an integer number (7444224).

Almost surely, 2^149971521 is an apocalyptic number.

It is an amenable number.

149971521 is a deficient number, since it is larger than the sum of its proper divisors (88243647).

149971521 is a wasteful number, since it uses less digits than its factorization.

149971521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301.

The product of its digits is 22680, while the sum is 39.

The square root of 149971521 is about 12246.2860084190. The cubic root of 149971521 is about 531.2956564037.

The spelling of 149971521 in words is "one hundred forty-nine million, nine hundred seventy-one thousand, five hundred twenty-one".