31530223201 has 2 divisors, whose sum is σ = 31530223202. Its totient is φ = 31530223200.

The previous prime is 31530223199. The next prime is 31530223229. The reversal of 31530223201 is 10232203513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30180028176 + 1350195025 = 173724^2 + 36745^2 .

It is a cyclic number.

It is not a de Polignac number, because 31530223201 - 2¹ = 31530223199 is a prime.

Together with 31530223199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31530223271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15765111600 + 15765111601.

It is an arithmetic number, because the mean of its divisors is an integer number (15765111601).

Almost surely, 2^31530223201 is an apocalyptic number.

It is an amenable number.

31530223201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31530223201 is an equidigital number, since it uses as much as digits as its factorization.

31530223201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 31530223201 its reverse (10232203513), we get a palindrome (41762426714).

The spelling of 31530223201 in words is "thirty-one billion, five hundred thirty million, two hundred twenty-three thousand, two hundred one".