31121120023001 has 4 divisors (see below), whose sum is σ = 31962231375012. Its totient is φ = 30280008670992.

The previous prime is 31121120022991. The next prime is 31121120023013. The reversal of 31121120023001 is 10032002112113.

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 14180684775625 + 16940435247376 = 3765725^2 + 4115876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121120023001 is a prime.

It is a super-2 number, since 2×31121120023001² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31121120023031) 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, 420555675950 + ... + 420555676023.

It is an arithmetic number, because the mean of its divisors is an integer number (7990557843753).

Almost surely, 2^{31121120023001} is an apocalyptic number.

It is an amenable number.

31121120023001 is a deficient number, since it is larger than the sum of its proper divisors (841111352011).

31121120023001 is an equidigital number, since it uses as much as digits as its factorization.

31121120023001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841111352010.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31121120023001 its reverse (10032002112113), we get a palindrome (41153122135114).

The spelling of 31121120023001 in words is "thirty-one trillion, one hundred twenty-one billion, one hundred twenty million, twenty-three thousand, one".