31132542 has 48 divisors (see below), whose sum is σ = 76703760. Its totient is φ = 8370432.

The previous prime is 31132537. The next prime is 31132567. The reversal of 31132542 is 24523113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1884 + ... + 8112.

It is an arithmetic number, because the mean of its divisors is an integer number (1597995).

Almost surely, 2^31132542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31132542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38351880).

31132542 is an abundant number, since it is smaller than the sum of its proper divisors (45571218).

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

31132542 is a wasteful number, since it uses less digits than its factorization.

31132542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6265 (or 6258 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 31132542 is about 5579.6542903660. The cubic root of 31132542 is about 314.5851328562.

Adding to 31132542 its reverse (24523113), we get a palindrome (55655655).

The spelling of 31132542 in words is "thirty-one million, one hundred thirty-two thousand, five hundred forty-two".