31522 has 4 divisors (see below), whose sum is σ = 47286. Its totient is φ = 15760.

The previous prime is 31517. The next prime is 31531. The reversal of 31522 is 22513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22513 = 47 ⋅479.

It can be written as a sum of positive squares in only one way, i.e., 25281 + 6241 = 159^2 + 79^2 .

It is a plaindrome in base 13.

It is a nialpdrome in base 8.

It is an unprimeable number.

31522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7879 + ... + 7882.

2³¹⁵²² is an apocalyptic number.

31522 is a deficient number, since it is larger than the sum of its proper divisors (15764).

31522 is a wasteful number, since it uses less digits than its factorization.

31522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15763.

The product of its digits is 60, while the sum is 13.

The square root of 31522 is about 177.5443606539. The cubic root of 31522 is about 31.5891486535.

Subtracting from 31522 its reverse (22513), we obtain a palindrome (9009).

The spelling of 31522 in words is "thirty-one thousand, five hundred twenty-two".