251530361 has 2 divisors, whose sum is σ = 251530362. Its totient is φ = 251530360.

The previous prime is 251530313. The next prime is 251530381. The reversal of 251530361 is 163035152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172764736 + 78765625 = 13144^2 + 8875^2 .

It is a cyclic number.

It is not a de Polignac number, because 251530361 - 2⁶ = 251530297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251530361.

It is not a weakly prime, because it can be changed into another prime (251530381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125765180 + 125765181.

It is an arithmetic number, because the mean of its divisors is an integer number (125765181).

Almost surely, 2^251530361 is an apocalyptic number.

It is an amenable number.

251530361 is a deficient number, since it is larger than the sum of its proper divisors (1).

251530361 is an equidigital number, since it uses as much as digits as its factorization.

251530361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 251530361 is about 15859.7087299862. The cubic root of 251530361 is about 631.2433336420.

The spelling of 251530361 in words is "two hundred fifty-one million, five hundred thirty thousand, three hundred sixty-one".