151909221 has 16 divisors (see below), whose sum is σ = 209885760. Its totient is φ = 97614720.

The previous prime is 151909213. The next prime is 151909231. The reversal of 151909221 is 122909151.

It is not a de Polignac number, because 151909221 - 2³ = 151909213 is a prime.

It is a super-2 number, since 2×151909221² = 46152822849653682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151909231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69481 + ... + 71633.

It is an arithmetic number, because the mean of its divisors is an integer number (13117860).

Almost surely, 2^151909221 is an apocalyptic number.

It is an amenable number.

151909221 is a deficient number, since it is larger than the sum of its proper divisors (57976539).

151909221 is a wasteful number, since it uses less digits than its factorization.

151909221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996.

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 151909221 is about 12325.1458814896. The cubic root of 151909221 is about 533.5740652389.

The spelling of 151909221 in words is "one hundred fifty-one million, nine hundred nine thousand, two hundred twenty-one".