149776221 has 32 divisors (see below), whose sum is σ = 248012800. Its totient is φ = 78459840.

The previous prime is 149776219. The next prime is 149776229. The reversal of 149776221 is 122677941.

It is not a de Polignac number, because 149776221 - 2¹ = 149776219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 149776221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149776229) 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 31 ways as a sum of consecutive naturals, for example, 6315 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (7750400).

Almost surely, 2^149776221 is an apocalyptic number.

It is an amenable number.

149776221 is a deficient number, since it is larger than the sum of its proper divisors (98236579).

149776221 is a wasteful number, since it uses less digits than its factorization.

149776221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12169.

The product of its digits is 42336, while the sum is 39.

The square root of 149776221 is about 12238.3095646417. The cubic root of 149776221 is about 531.0649301189.

The spelling of 149776221 in words is "one hundred forty-nine million, seven hundred seventy-six thousand, two hundred twenty-one".