31117542 has 16 divisors (see below), whose sum is σ = 62320752. Its totient is φ = 10358240.

The previous prime is 31117523. The next prime is 31117553. The reversal of 31117542 is 24571113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768 + ... + 8084.

It is an arithmetic number, because the mean of its divisors is an integer number (3895047).

Almost surely, 2^31117542 is an apocalyptic number.

31117542 is an abundant number, since it is smaller than the sum of its proper divisors (31203210).

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

31117542 is a wasteful number, since it uses less digits than its factorization.

31117542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7143.

The product of its digits is 840, while the sum is 24.

The square root of 31117542 is about 5578.3099591184. The cubic root of 31117542 is about 314.5346012180.

Adding to 31117542 its reverse (24571113), we get a palindrome (55688655).

The spelling of 31117542 in words is "thirty-one million, one hundred seventeen thousand, five hundred forty-two".