31200011231 has 2 divisors, whose sum is σ = 31200011232. Its totient is φ = 31200011230.

The previous prime is 31200011189. The next prime is 31200011261. The reversal of 31200011231 is 13211000213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31200011231 is a prime.

It is a super-2 number, since 2×31200011231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31200011261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600005615 + 15600005616.

It is an arithmetic number, because the mean of its divisors is an integer number (15600005616).

Almost surely, 2^31200011231 is an apocalyptic number.

31200011231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200011231 is an equidigital number, since it uses as much as digits as its factorization.

31200011231 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 31200011231 its reverse (13211000213), we get a palindrome (44411011444).

The spelling of 31200011231 in words is "thirty-one billion, two hundred million, eleven thousand, two hundred thirty-one".