155221475 has 24 divisors (see below), whose sum is σ = 209325888. Its totient is φ = 113702400.

The previous prime is 155221459. The next prime is 155221481. The reversal of 155221475 is 574122551.

155221475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155221475 - 2⁴ = 155221459 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10790 + ... + 20660.

It is an arithmetic number, because the mean of its divisors is an integer number (8721912).

Almost surely, 2^155221475 is an apocalyptic number.

155221475 is a deficient number, since it is larger than the sum of its proper divisors (54104413).

155221475 is a wasteful number, since it uses less digits than its factorization.

155221475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9935 (or 9930 counting only the distinct ones).

The product of its digits is 14000, while the sum is 32.

The square root of 155221475 is about 12458.7910729733. The cubic root of 155221475 is about 537.4242619082.

The spelling of 155221475 in words is "one hundred fifty-five million, two hundred twenty-one thousand, four hundred seventy-five".