251521363 has 2 divisors, whose sum is σ = 251521364. Its totient is φ = 251521362.

The previous prime is 251521351. The next prime is 251521421. The reversal of 251521363 is 363125152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251521363 - 2⁵ = 251521331 is a prime.

It is not a weakly prime, because it can be changed into another prime (251521343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125760681 + 125760682.

It is an arithmetic number, because the mean of its divisors is an integer number (125760682).

Almost surely, 2^251521363 is an apocalyptic number.

251521363 is a deficient number, since it is larger than the sum of its proper divisors (1).

251521363 is an equidigital number, since it uses as much as digits as its factorization.

251521363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 251521363 is about 15859.4250526304. The cubic root of 251521363 is about 631.2358063926.

The spelling of 251521363 in words is "two hundred fifty-one million, five hundred twenty-one thousand, three hundred sixty-three".