251222205 has 32 divisors (see below), whose sum is σ = 433689984. Its totient is φ = 123446016.

The previous prime is 251222203. The next prime is 251222239. The reversal of 251222205 is 502222152.

It is not a de Polignac number, because 251222205 - 2¹ = 251222203 is a prime.

It is a super-2 number, since 2×251222205² = 126225192570124050, 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 31 ways as a sum of consecutive naturals, for example, 152647 + ... + 154283.

It is an arithmetic number, because the mean of its divisors is an integer number (13552812).

Almost surely, 2^251222205 is an apocalyptic number.

It is an amenable number.

251222205 is a deficient number, since it is larger than the sum of its proper divisors (182467779).

251222205 is a wasteful number, since it uses less digits than its factorization.

251222205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 251222205 is about 15849.9906940036. The cubic root of 251222205 is about 630.9854444131.

Adding to 251222205 its reverse (502222152), we get a palindrome (753444357).

The spelling of 251222205 in words is "two hundred fifty-one million, two hundred twenty-two thousand, two hundred five".