31113220001 has 2 divisors, whose sum is σ = 31113220002. Its totient is φ = 31113220000.

The previous prime is 31113219997. The next prime is 31113220027. The reversal of 31113220001 is 10002231113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30406989376 + 706230625 = 174376^2 + 26575^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113220001 - 2² = 31113219997 is a prime.

It is not a weakly prime, because it can be changed into another prime (31113220601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556610000 + 15556610001.

It is an arithmetic number, because the mean of its divisors is an integer number (15556610001).

Almost surely, 2^31113220001 is an apocalyptic number.

It is an amenable number.

31113220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113220001 is an equidigital number, since it uses as much as digits as its factorization.

31113220001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31113220001 its reverse (10002231113), we get a palindrome (41115451114).

It can be divided in two parts, 311132 and 20001, that added together give a palindrome (331133).

The spelling of 31113220001 in words is "thirty-one billion, one hundred thirteen million, two hundred twenty thousand, one".