31861398253 has 2 divisors, whose sum is σ = 31861398254. Its totient is φ = 31861398252.

The previous prime is 31861398229. The next prime is 31861398299. The reversal of 31861398253 is 35289316813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31514060484 + 347337769 = 177522^2 + 18637^2 .

It is a cyclic number.

It is not a de Polignac number, because 31861398253 - 2⁹ = 31861397741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31861398197 and 31861398206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31861398203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15930699126 + 15930699127.

It is an arithmetic number, because the mean of its divisors is an integer number (15930699127).

Almost surely, 2^31861398253 is an apocalyptic number.

It is an amenable number.

31861398253 is a deficient number, since it is larger than the sum of its proper divisors (1).

31861398253 is an equidigital number, since it uses as much as digits as its factorization.

31861398253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 49.

The spelling of 31861398253 in words is "thirty-one billion, eight hundred sixty-one million, three hundred ninety-eight thousand, two hundred fifty-three".