31661322 has 32 divisors (see below), whose sum is σ = 78948864. Its totient is φ = 8223600.

The previous prime is 31661309. The next prime is 31661351. The reversal of 31661322 is 22316613.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31661292 and 31661301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33804 + ... + 34727.

It is an arithmetic number, because the mean of its divisors is an integer number (2467152).

Almost surely, 2^31661322 is an apocalyptic number.

31661322 is an abundant number, since it is smaller than the sum of its proper divisors (47287542).

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

31661322 is a wasteful number, since it uses less digits than its factorization.

31661322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68554.

The product of its digits is 1296, while the sum is 24.

The square root of 31661322 is about 5626.8394325767. The cubic root of 31661322 is about 316.3561985094.

Adding to 31661322 its reverse (22316613), we get a palindrome (53977935).

The spelling of 31661322 in words is "thirty-one million, six hundred sixty-one thousand, three hundred twenty-two".