251421313 has 16 divisors (see below), whose sum is σ = 312754176. Its totient is φ = 198570240.

The previous prime is 251421299. The next prime is 251421323. The reversal of 251421313 is 313124152.

It is a happy number.

251421313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 251421313 - 2⁹ = 251420801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251421323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49281 + ... + 54142.

It is an arithmetic number, because the mean of its divisors is an integer number (19547136).

Almost surely, 2^251421313 is an apocalyptic number.

It is an amenable number.

251421313 is a deficient number, since it is larger than the sum of its proper divisors (61332863).

251421313 is a wasteful number, since it uses less digits than its factorization.

251421313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103464.

The product of its digits is 720, while the sum is 22.

The square root of 251421313 is about 15856.2704631322. The cubic root of 251421313 is about 631.1520977731.

Adding to 251421313 its reverse (313124152), we get a palindrome (564545465).

The spelling of 251421313 in words is "two hundred fifty-one million, four hundred twenty-one thousand, three hundred thirteen".