251220002 has 16 divisors (see below), whose sum is σ = 411495552. Its totient is φ = 114077520.

The previous prime is 251219977. The next prime is 251220023. The reversal of 251220002 is 200022152.

It is a super-2 number, since 2×251220002² = 126222978809760008, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19463 + ... + 29685.

It is an arithmetic number, because the mean of its divisors is an integer number (25718472).

Almost surely, 2^251220002 is an apocalyptic number.

251220002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

251220002 is a deficient number, since it is larger than the sum of its proper divisors (160275550).

251220002 is a wasteful number, since it uses less digits than its factorization.

251220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11353.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 251220002 is about 15849.9211985423. The cubic root of 251220002 is about 630.9836000101.

Adding to 251220002 its reverse (200022152), we get a palindrome (451242154).

The spelling of 251220002 in words is "two hundred fifty-one million, two hundred twenty thousand, two".