151564321 has 8 divisors (see below), whose sum is σ = 158214824. Its totient is φ = 145048320.

The previous prime is 151564313. The next prime is 151564327. The reversal of 151564321 is 123465151.

It can be written as a sum of positive squares in 4 ways, for example, as 4669921 + 146894400 = 2161^2 + 12120^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 151564321 - 2³ = 151564313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 151564321.

It is not an unprimeable number, because it can be changed into a prime (151564327) 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, 31320 + ... + 35833.

It is an arithmetic number, because the mean of its divisors is an integer number (19776853).

Almost surely, 2^151564321 is an apocalyptic number.

It is an amenable number.

151564321 is a deficient number, since it is larger than the sum of its proper divisors (6650503).

151564321 is an equidigital number, since it uses as much as digits as its factorization.

151564321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67251.

The product of its digits is 3600, while the sum is 28.

The square root of 151564321 is about 12311.1462098377. The cubic root of 151564321 is about 533.1699441775.

Subtracting from 151564321 its product of digits (3600), we obtain a square (151560721 = 12311²).

The spelling of 151564321 in words is "one hundred fifty-one million, five hundred sixty-four thousand, three hundred twenty-one".