251223625 has 8 divisors (see below), whose sum is σ = 313527240. Its totient is φ = 200978800.

The previous prime is 251223619. The next prime is 251223667. The reversal of 251223625 is 526322152.

It can be written as a sum of positive squares in 4 ways, for example, as 71368704 + 179854921 = 8448^2 + 13411^2 .

It is not a de Polignac number, because 251223625 - 2¹⁵ = 251190857 is a prime.

It is a super-2 number, since 2×251223625² = 126226619516281250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251223593 and 251223602.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1004770 + ... + 1005019.

It is an arithmetic number, because the mean of its divisors is an integer number (39190905).

Almost surely, 2^251223625 is an apocalyptic number.

251223625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251223625 is a deficient number, since it is larger than the sum of its proper divisors (62303615).

251223625 is an equidigital number, since it uses as much as digits as its factorization.

251223625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009804 (or 2009794 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 251223625 is about 15850.0354889193. The cubic root of 251223625 is about 630.9866332646.

Adding to 251223625 its reverse (526322152), we get a palindrome (777545777).

The spelling of 251223625 in words is "two hundred fifty-one million, two hundred twenty-three thousand, six hundred twenty-five".