918531 has 6 divisors (see below), whose sum is σ = 1326780. Its totient is φ = 612348.

The previous prime is 918529. The next prime is 918539. The reversal of 918531 is 135819.

It is not a de Polignac number, because 918531 - 2¹ = 918529 is a prime.

It is a super-2 number, since 2×918531² = 1687398395922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 918495 and 918504.

It is not an unprimeable number, because it can be changed into a prime (918539) 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, 51021 + ... + 51038.

It is an arithmetic number, because the mean of its divisors is an integer number (221130).

2⁹¹⁸⁵³¹ is an apocalyptic number.

918531 is a deficient number, since it is larger than the sum of its proper divisors (408249).

918531 is a wasteful number, since it uses less digits than its factorization.

918531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102065 (or 102062 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 918531 is about 958.4002295492. The cubic root of 918531 is about 97.2070893574.

It can be divided in two parts, 9185 and 31, that added together give a square (9216 = 96²).

The spelling of 918531 in words is "nine hundred eighteen thousand, five hundred thirty-one".