31222001 has 4 divisors (see below), whose sum is σ = 31572900. Its totient is φ = 30871104.

The previous prime is 31221977. The next prime is 31222021. The reversal of 31222001 is 10022213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10022213 = 887 ⋅11299.

It can be written as a sum of positive squares in 2 ways, for example, as 4431025 + 26790976 = 2105^2 + 5176^2 .

It is a cyclic number.

It is not a de Polignac number, because 31222001 - 2⁶ = 31221937 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 175316 + ... + 175493.

It is an arithmetic number, because the mean of its divisors is an integer number (7893225).

Almost surely, 2^31222001 is an apocalyptic number.

It is an amenable number.

31222001 is a deficient number, since it is larger than the sum of its proper divisors (350899).

31222001 is an equidigital number, since it uses as much as digits as its factorization.

31222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350898.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31222001 is about 5587.6650758613. The cubic root of 31222001 is about 314.8861636197.

Adding to 31222001 its reverse (10022213), we get a palindrome (41244214).

The spelling of 31222001 in words is "thirty-one million, two hundred twenty-two thousand, one".