152891221 has 8 divisors (see below), whose sum is σ = 178299200. Its totient is φ = 131049324.

The previous prime is 152891213. The next prime is 152891269. The reversal of 152891221 is 122198251.

It is not a de Polignac number, because 152891221 - 2³ = 152891213 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 (152894221) 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, 222531 + ... + 223216.

It is an arithmetic number, because the mean of its divisors is an integer number (22287400).

Almost surely, 2^152891221 is an apocalyptic number.

It is an amenable number.

152891221 is a deficient number, since it is larger than the sum of its proper divisors (25407979).

152891221 is an frugal number, since it uses more digits than its factorization.

152891221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445768 (or 445754 counting only the distinct ones).

The product of its digits is 2880, while the sum is 31.

The square root of 152891221 is about 12364.9189645545. The cubic root of 152891221 is about 534.7213397280.

The spelling of 152891221 in words is "one hundred fifty-two million, eight hundred ninety-one thousand, two hundred twenty-one".