31123222001 has 4 divisors (see below), whose sum is σ = 31180751604. Its totient is φ = 31065692400.

The previous prime is 31123221989. The next prime is 31123222019. The reversal of 31123222001 is 10022232113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8675991025 + 22447230976 = 93145^2 + 149824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31123222001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123222301) 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, 28763990 + ... + 28765071.

It is an arithmetic number, because the mean of its divisors is an integer number (7795187901).

Almost surely, 2^31123222001 is an apocalyptic number.

It is an amenable number.

31123222001 is a deficient number, since it is larger than the sum of its proper divisors (57529603).

31123222001 is an equidigital number, since it uses as much as digits as its factorization.

31123222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57529602.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31123222001 its reverse (10022232113), we get a palindrome (41145454114).

The spelling of 31123222001 in words is "thirty-one billion, one hundred twenty-three million, two hundred twenty-two thousand, one".