151338921 has 4 divisors (see below), whose sum is σ = 201785232. Its totient is φ = 100892612.

The previous prime is 151338911. The next prime is 151338923. The reversal of 151338921 is 129833151.

151338921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 151338921 - 2⁷ = 151338793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (151338923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25223151 + ... + 25223156.

It is an arithmetic number, because the mean of its divisors is an integer number (50446308).

Almost surely, 2^151338921 is an apocalyptic number.

It is an amenable number.

151338921 is a deficient number, since it is larger than the sum of its proper divisors (50446311).

151338921 is an equidigital number, since it uses as much as digits as its factorization.

151338921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50446310.

The product of its digits is 6480, while the sum is 33.

The square root of 151338921 is about 12301.9884977999. The cubic root of 151338921 is about 532.9055105085.

The spelling of 151338921 in words is "one hundred fifty-one million, three hundred thirty-eight thousand, nine hundred twenty-one".