154772221 has 8 divisors (see below), whose sum is σ = 165867264. Its totient is φ = 144041040.

The previous prime is 154772197. The next prime is 154772227. The reversal of 154772221 is 122277451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 154772221 - 2¹¹ = 154770173 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 (154772227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90085 + ... + 91786.

It is an arithmetic number, because the mean of its divisors is an integer number (20733408).

Almost surely, 2^154772221 is an apocalyptic number.

It is an amenable number.

154772221 is a deficient number, since it is larger than the sum of its proper divisors (11095043).

154772221 is a wasteful number, since it uses less digits than its factorization.

154772221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181931.

The product of its digits is 7840, while the sum is 31.

The square root of 154772221 is about 12440.7484099631. The cubic root of 154772221 is about 536.9052759322.

The spelling of 154772221 in words is "one hundred fifty-four million, seven hundred seventy-two thousand, two hundred twenty-one".