251870 has 16 divisors (see below), whose sum is σ = 460080. Its totient is φ = 99264.

The previous prime is 251861. The next prime is 251879. The reversal of 251870 is 78152.

It is an interprime number because it is at equal distance from previous prime (251861) and next prime (251879).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251879) by changing a digit.

251870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749 + ... + 1031.

It is an arithmetic number, because the mean of its divisors is an integer number (28755).

2²⁵¹⁸⁷⁰ is an apocalyptic number.

251870 is a deficient number, since it is larger than the sum of its proper divisors (208210).

251870 is a wasteful number, since it uses less digits than its factorization.

251870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 251870 is about 501.8665161176. The cubic root of 251870 is about 63.1527326434.

It can be divided in two parts, 2 and 51870, that multiplied together give a triangular number (103740 = T₄₅₅).

The spelling of 251870 in words is "two hundred fifty-one thousand, eight hundred seventy".