31220023001 has 2 divisors, whose sum is σ = 31220023002. Its totient is φ = 31220023000.

The previous prime is 31220022991. The next prime is 31220023063. The reversal of 31220023001 is 10032002213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29782475776 + 1437547225 = 172576^2 + 37915^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220023001 - 2⁶ = 31220022937 is a prime.

It is not a weakly prime, because it can be changed into another prime (31220023091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610011500 + 15610011501.

It is an arithmetic number, because the mean of its divisors is an integer number (15610011501).

Almost surely, 2^31220023001 is an apocalyptic number.

It is an amenable number.

31220023001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220023001 is an equidigital number, since it uses as much as digits as its factorization.

31220023001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31220023001 its reverse (10032002213), we get a palindrome (41252025214).

The spelling of 31220023001 in words is "thirty-one billion, two hundred twenty million, twenty-three thousand, one".