631158 has 32 divisors (see below), whose sum is σ = 1406592. Its totient is φ = 187200.

The previous prime is 631157. The next prime is 631171. The reversal of 631158 is 851136.

631158 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4753 + ... + 4883.

It is an arithmetic number, because the mean of its divisors is an integer number (43956).

2⁶³¹¹⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703296).

631158 is an abundant number, since it is smaller than the sum of its proper divisors (775434).

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

631158 is a wasteful number, since it uses less digits than its factorization.

631158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220.

The product of its digits is 720, while the sum is 24.

The square root of 631158 is about 794.4545298505. The cubic root of 631158 is about 85.7786809742.

It can be divided in two parts, 63 and 1158, that added together give a palindrome (1221).

The spelling of 631158 in words is "six hundred thirty-one thousand, one hundred fifty-eight".