251212425 has 24 divisors (see below), whose sum is σ = 426567936. Its totient is φ = 130357440.

The previous prime is 251212397. The next prime is 251212459. The reversal of 251212425 is 524212152.

It is not a de Polignac number, because 251212425 - 2⁹ = 251211913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251212395 and 251212404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42489 + ... + 48038.

It is an arithmetic number, because the mean of its divisors is an integer number (17773664).

Almost surely, 2^251212425 is an apocalyptic number.

251212425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251212425 is a deficient number, since it is larger than the sum of its proper divisors (175355511).

251212425 is a wasteful number, since it uses less digits than its factorization.

251212425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90577 (or 90572 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 251212425 is about 15849.6821734696. The cubic root of 251212425 is about 630.9772562864.

Adding to 251212425 its reverse (524212152), we get a palindrome (775424577).

The spelling of 251212425 in words is "two hundred fifty-one million, two hundred twelve thousand, four hundred twenty-five".