251204022 has 96 divisors (see below), whose sum is σ = 591072768. Its totient is φ = 76906368.

The previous prime is 251204011. The next prime is 251204029. The reversal of 251204022 is 220402152.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 251203986 and 251204004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251204029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1833538 + ... + 1833674.

It is an arithmetic number, because the mean of its divisors is an integer number (6157008).

Almost surely, 2^251204022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251204022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295536384).

251204022 is an abundant number, since it is smaller than the sum of its proper divisors (339868746).

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

251204022 is a wasteful number, since it uses less digits than its factorization.

251204022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 251204022 is about 15849.4170870730. The cubic root of 251204022 is about 630.9702208582.

Adding to 251204022 its reverse (220402152), we get a palindrome (471606174).

The spelling of 251204022 in words is "two hundred fifty-one million, two hundred four thousand, twenty-two".