251320393 has 2 divisors, whose sum is σ = 251320394. Its totient is φ = 251320392.

The previous prime is 251320361. The next prime is 251320397. The reversal of 251320393 is 393023152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244985104 + 6335289 = 15652^2 + 2517^2 .

It is a cyclic number.

It is not a de Polignac number, because 251320393 - 2⁵ = 251320361 is a prime.

It is a super-3 number, since 3×251320393³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (251320397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125660196 + 125660197.

It is an arithmetic number, because the mean of its divisors is an integer number (125660197).

Almost surely, 2^251320393 is an apocalyptic number.

It is an amenable number.

251320393 is a deficient number, since it is larger than the sum of its proper divisors (1).

251320393 is an equidigital number, since it uses as much as digits as its factorization.

251320393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 251320393 is about 15853.0878064811. The cubic root of 251320393 is about 631.0676387518.

The spelling of 251320393 in words is "two hundred fifty-one million, three hundred twenty thousand, three hundred ninety-three".