251805852 has 18 divisors (see below), whose sum is σ = 636509328. Its totient is φ = 83935272.

The previous prime is 251805847. The next prime is 251805857. The reversal of 251805852 is 258508152.

251805852 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (251805847) and next prime (251805857).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6994607 = 251805852 / (2 + 5 + 1 + 8 + 0 + 5 + 8 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251805857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3497268 + ... + 3497339.

Almost surely, 2^251805852 is an apocalyptic number.

It is an amenable number.

251805852 is an abundant number, since it is smaller than the sum of its proper divisors (384703476).

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

251805852 is a wasteful number, since it uses less digits than its factorization.

251805852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994617 (or 6994612 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 251805852 is about 15868.3916009153. The cubic root of 251805852 is about 631.4737079606.

The spelling of 251805852 in words is "two hundred fifty-one million, eight hundred five thousand, eight hundred fifty-two".