151139921 has 4 divisors (see below), whose sum is σ = 154355712. Its totient is φ = 147924132.

The previous prime is 151139897. The next prime is 151139953. The reversal of 151139921 is 129931151.

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 151139921 - 2¹⁴ = 151123537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151139971) 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, 1607825 + ... + 1607918.

It is an arithmetic number, because the mean of its divisors is an integer number (38588928).

Almost surely, 2^151139921 is an apocalyptic number.

It is an amenable number.

151139921 is a deficient number, since it is larger than the sum of its proper divisors (3215791).

151139921 is an equidigital number, since it uses as much as digits as its factorization.

151139921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215790.

The product of its digits is 2430, while the sum is 32.

The square root of 151139921 is about 12293.8977139067. The cubic root of 151139921 is about 532.6718303425.

The spelling of 151139921 in words is "one hundred fifty-one million, one hundred thirty-nine thousand, nine hundred twenty-one".