31622161 has 8 divisors (see below), whose sum is σ = 32548520. Its totient is φ = 30699648.

The previous prime is 31622153. The next prime is 31622167. The reversal of 31622161 is 16122613.

It can be written as a sum of positive squares in 4 ways, for example, as 5612161 + 26010000 = 2369^2 + 5100^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31622161 - 2³ = 31622153 is a prime.

It is a super-2 number, since 2×31622161² = 1999922132619842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31622167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27445 + ... + 28573.

It is an arithmetic number, because the mean of its divisors is an integer number (4068565).

Almost surely, 2^31622161 is an apocalyptic number.

It is an amenable number.

31622161 is a deficient number, since it is larger than the sum of its proper divisors (926359).

31622161 is a wasteful number, since it uses less digits than its factorization.

31622161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923.

The product of its digits is 432, while the sum is 22.

The square root of 31622161 is about 5623.3585160471. The cubic root of 31622161 is about 316.2257139979.

Adding to 31622161 its reverse (16122613), we get a palindrome (47744774).

The spelling of 31622161 in words is "thirty-one million, six hundred twenty-two thousand, one hundred sixty-one".