251625563 has 4 divisors (see below), whose sum is σ = 287572080. Its totient is φ = 215679048.

The previous prime is 251625533. The next prime is 251625599. The reversal of 251625563 is 365526152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251625563 - 2¹² = 251621467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251625523) 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 in 3 ways as a sum of consecutive naturals, for example, 17973248 + ... + 17973261.

It is an arithmetic number, because the mean of its divisors is an integer number (71893020).

Almost surely, 2^251625563 is an apocalyptic number.

251625563 is a deficient number, since it is larger than the sum of its proper divisors (35946517).

251625563 is an equidigital number, since it uses as much as digits as its factorization.

251625563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35946516.

The product of its digits is 54000, while the sum is 35.

The square root of 251625563 is about 15862.7098252474. The cubic root of 251625563 is about 631.3229635885.

The spelling of 251625563 in words is "two hundred fifty-one million, six hundred twenty-five thousand, five hundred sixty-three".