251222200 has 48 divisors (see below), whose sum is σ = 592127280. Its totient is φ = 99106560.

The previous prime is 251222189. The next prime is 251222201. The reversal of 251222200 is 2222152.

It is a super-2 number, since 2×251222200² = 126225187545680000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251222201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5997 + ... + 23203.

It is an arithmetic number, because the mean of its divisors is an integer number (12335985).

Almost surely, 2^251222200 is an apocalyptic number.

251222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296063640).

251222200 is an abundant number, since it is smaller than the sum of its proper divisors (340905080).

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

251222200 is a wasteful number, since it uses less digits than its factorization.

251222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17296 (or 17287 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 251222200 is about 15849.9905362748. The cubic root of 251222200 is about 630.9854402270.

Adding to 251222200 its reverse (2222152), we get a palindrome (253444352).

The spelling of 251222200 in words is "two hundred fifty-one million, two hundred twenty-two thousand, two hundred".