31222081 has 16 divisors (see below), whose sum is σ = 36436608. Its totient is φ = 26438400.

The previous prime is 31222021. The next prime is 31222091. The reversal of 31222081 is 18022213.

It is a de Polignac number, because none of the positive numbers 2^k-31222081 is a prime.

It is a super-2 number, since 2×31222081² = 1949636683941122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31222021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18451 + ... + 20071.

It is an arithmetic number, because the mean of its divisors is an integer number (2277288).

Almost surely, 2^31222081 is an apocalyptic number.

It is an amenable number.

31222081 is a deficient number, since it is larger than the sum of its proper divisors (5214527).

31222081 is a wasteful number, since it uses less digits than its factorization.

31222081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 31222081 is about 5587.6722344819. The cubic root of 31222081 is about 314.8864325633.

Adding to 31222081 its reverse (18022213), we get a palindrome (49244294).

The spelling of 31222081 in words is "thirty-one million, two hundred twenty-two thousand, eighty-one".