251530313 has 2 divisors, whose sum is σ = 251530314. Its totient is φ = 251530312.

The previous prime is 251530297. The next prime is 251530361. The reversal of 251530313 is 313035152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210018064 + 41512249 = 14492^2 + 6443^2 .

It is a cyclic number.

It is not a de Polignac number, because 251530313 - 2⁴ = 251530297 is a prime.

It is not a weakly prime, because it can be changed into another prime (251580313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125765156 + 125765157.

It is an arithmetic number, because the mean of its divisors is an integer number (125765157).

Almost surely, 2^251530313 is an apocalyptic number.

It is an amenable number.

251530313 is a deficient number, since it is larger than the sum of its proper divisors (1).

251530313 is an equidigital number, since it uses as much as digits as its factorization.

251530313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 251530313 is about 15859.7072167175. The cubic root of 251530313 is about 631.2432934882.

Adding to 251530313 its reverse (313035152), we get a palindrome (564565465).

The spelling of 251530313 in words is "two hundred fifty-one million, five hundred thirty thousand, three hundred thirteen".