251225740 has 12 divisors (see below), whose sum is σ = 527574096. Its totient is φ = 100490288.

The previous prime is 251225719. The next prime is 251225747. The reversal of 251225740 is 47522152.

It is a super-2 number, since 2×251225740² = 126228744877095200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251225699 and 251225708.

It is not an unprimeable number, because it can be changed into a prime (251225747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6280624 + ... + 6280663.

It is an arithmetic number, because the mean of its divisors is an integer number (43964508).

Almost surely, 2^251225740 is an apocalyptic number.

251225740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251225740 is an abundant number, since it is smaller than the sum of its proper divisors (276348356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251225740 is a wasteful number, since it uses less digits than its factorization.

251225740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12561296 (or 12561294 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 251225740 is about 15850.1022078724. The cubic root of 251225740 is about 630.9884039752.

Adding to 251225740 its reverse (47522152), we get a palindrome (298747892).

The spelling of 251225740 in words is "two hundred fifty-one million, two hundred twenty-five thousand, seven hundred forty".