31130532 has 18 divisors (see below), whose sum is σ = 78691158. Its totient is φ = 10376832.

The previous prime is 31130527. The next prime is 31130549. The reversal of 31130532 is 23503113.

31130532 is a `hidden beast` number, since 3 + 1 + 130 + 532 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24443136 + 6687396 = 4944^2 + 2586^2 .

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

It is a super-2 number, since 2×31130532² = 1938220045206048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432333 + ... + 432404.

It is an arithmetic number, because the mean of its divisors is an integer number (4371731).

Almost surely, 2^31130532 is an apocalyptic number.

It is an amenable number.

31130532 is an abundant number, since it is smaller than the sum of its proper divisors (47560626).

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

31130532 is a wasteful number, since it uses less digits than its factorization.

31130532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864747 (or 864742 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 31130532 is about 5579.4741687725. The cubic root of 31130532 is about 314.5783625586.

Adding to 31130532 its reverse (23503113), we get a palindrome (54633645).

The spelling of 31130532 in words is "thirty-one million, one hundred thirty thousand, five hundred thirty-two".