31139222377 has 2 divisors, whose sum is σ = 31139222378. Its totient is φ = 31139222376.

The previous prime is 31139222363. The next prime is 31139222407. The reversal of 31139222377 is 77322293113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16374785296 + 14764437081 = 127964^2 + 121509^2 .

It is a cyclic number.

It is not a de Polignac number, because 31139222377 - 2¹⁹ = 31138698089 is a prime.

It is not a weakly prime, because it can be changed into another prime (31139222327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15569611188 + 15569611189.

It is an arithmetic number, because the mean of its divisors is an integer number (15569611189).

Almost surely, 2^31139222377 is an apocalyptic number.

It is an amenable number.

31139222377 is a deficient number, since it is larger than the sum of its proper divisors (1).

31139222377 is an equidigital number, since it uses as much as digits as its factorization.

31139222377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 40.

The spelling of 31139222377 in words is "thirty-one billion, one hundred thirty-nine million, two hundred twenty-two thousand, three hundred seventy-seven".