149568521 has 4 divisors (see below), whose sum is σ = 154393344. Its totient is φ = 144743700.

The previous prime is 149568511. The next prime is 149568527. The reversal of 149568521 is 125865941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149568521 - 2²² = 145374217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (149568527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2412365 + ... + 2412426.

It is an arithmetic number, because the mean of its divisors is an integer number (38598336).

Almost surely, 2^149568521 is an apocalyptic number.

It is an amenable number.

149568521 is a deficient number, since it is larger than the sum of its proper divisors (4824823).

149568521 is an equidigital number, since it uses as much as digits as its factorization.

149568521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824822.

The product of its digits is 86400, while the sum is 41.

The square root of 149568521 is about 12229.8209717068. The cubic root of 149568521 is about 530.8193343645.

The spelling of 149568521 in words is "one hundred forty-nine million, five hundred sixty-eight thousand, five hundred twenty-one".