251052005 has 16 divisors (see below), whose sum is σ = 322282800. Its totient is φ = 187072512.

The previous prime is 251051989. The next prime is 251052019. The reversal of 251052005 is 500250152.

It can be written as a sum of positive squares in 8 ways, for example, as 6880129 + 244171876 = 2623^2 + 15626^2 .

It is a cyclic number.

It is not a de Polignac number, because 251052005 - 2⁴ = 251051989 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6980 + ... + 23469.

It is an arithmetic number, because the mean of its divisors is an integer number (20142675).

Almost surely, 2^251052005 is an apocalyptic number.

It is an amenable number.

251052005 is a deficient number, since it is larger than the sum of its proper divisors (71230795).

251052005 is a wasteful number, since it uses less digits than its factorization.

251052005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30568.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 251052005 is about 15844.6206959965. The cubic root of 251052005 is about 630.8429172237.

The spelling of 251052005 in words is "two hundred fifty-one million, fifty-two thousand, five".