31861398229 has 2 divisors, whose sum is σ = 31861398230. Its totient is φ = 31861398228.

The previous prime is 31861398203. The next prime is 31861398253. The reversal of 31861398229 is 92289316813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19401704100 + 12459694129 = 139290^2 + 111623^2 .

It is a cyclic number.

It is not a de Polignac number, because 31861398229 - 2¹¹ = 31861396181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31861398299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15930699114 + 15930699115.

It is an arithmetic number, because the mean of its divisors is an integer number (15930699115).

Almost surely, 2^31861398229 is an apocalyptic number.

It is an amenable number.

31861398229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31861398229 is an equidigital number, since it uses as much as digits as its factorization.

31861398229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 52.

The spelling of 31861398229 in words is "thirty-one billion, eight hundred sixty-one million, three hundred ninety-eight thousand, two hundred twenty-nine".