251156 has 12 divisors (see below), whose sum is σ = 451668. Its totient is φ = 122112.

The previous prime is 251149. The next prime is 251159. The reversal of 251156 is 651152.

251156 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 234256 + 16900 = 484^2 + 130^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251159) by changing a digit.

251156 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 3 ways as a sum of consecutive naturals, for example, 701 + ... + 996.

It is an arithmetic number, because the mean of its divisors is an integer number (37639).

2²⁵¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

251156 is a deficient number, since it is larger than the sum of its proper divisors (200512).

251156 is a wasteful number, since it uses less digits than its factorization.

251156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738 (or 1736 counting only the distinct ones).

The product of its digits is 300, while the sum is 20.

The square root of 251156 is about 501.1546667447. The cubic root of 251156 is about 63.0930011333.

It can be divided in two parts, 25 and 1156, that multiplied together give a square (28900 = 170²).

The spelling of 251156 in words is "two hundred fifty-one thousand, one hundred fifty-six".