151873921 has 4 divisors (see below), whose sum is σ = 153218052. Its totient is φ = 150529792.

The previous prime is 151873907. The next prime is 151873949. The reversal of 151873921 is 129378151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32080896 + 119793025 = 5664^2 + 10945^2 .

It is a cyclic number.

It is not a de Polignac number, because 151873921 - 2⁵ = 151873889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151873321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671896 + ... + 672121.

It is an arithmetic number, because the mean of its divisors is an integer number (38304513).

Almost surely, 2^151873921 is an apocalyptic number.

It is an amenable number.

151873921 is a deficient number, since it is larger than the sum of its proper divisors (1344131).

151873921 is a wasteful number, since it uses less digits than its factorization.

151873921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344130.

The product of its digits is 15120, while the sum is 37.

The square root of 151873921 is about 12323.7137665559. The cubic root of 151873921 is about 533.5327321683.

The spelling of 151873921 in words is "one hundred fifty-one million, eight hundred seventy-three thousand, nine hundred twenty-one".