31112220277 has 2 divisors, whose sum is σ = 31112220278. Its totient is φ = 31112220276.

The previous prime is 31112220173. The next prime is 31112220317. The reversal of 31112220277 is 77202221113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31091916241 + 20304036 = 176329^2 + 4506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31112220277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31112220877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556110138 + 15556110139.

It is an arithmetic number, because the mean of its divisors is an integer number (15556110139).

Almost surely, 2^31112220277 is an apocalyptic number.

It is an amenable number.

31112220277 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112220277 is an equidigital number, since it uses as much as digits as its factorization.

31112220277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The spelling of 31112220277 in words is "thirty-one billion, one hundred twelve million, two hundred twenty thousand, two hundred seventy-seven".