320115251 has 4 divisors (see below), whose sum is σ = 325363104. Its totient is φ = 314867400.

The previous prime is 320115241. The next prime is 320115281. The reversal of 320115251 is 152511023.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 320115251 - 2²² = 315920947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320115241) 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, 2623835 + ... + 2623956.

It is an arithmetic number, because the mean of its divisors is an integer number (81340776).

Almost surely, 2^320115251 is an apocalyptic number.

320115251 is a deficient number, since it is larger than the sum of its proper divisors (5247853).

320115251 is an equidigital number, since it uses as much as digits as its factorization.

320115251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5247852.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 320115251 is about 17891.7648933804. The cubic root of 320115251 is about 684.0724839969.

Adding to 320115251 its reverse (152511023), we get a palindrome (472626274).

The spelling of 320115251 in words is "three hundred twenty million, one hundred fifteen thousand, two hundred fifty-one".