31098868681 has 2 divisors, whose sum is σ = 31098868682. Its totient is φ = 31098868680.

The previous prime is 31098868667. The next prime is 31098868727. The reversal of 31098868681 is 18686889013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30274260025 + 824608656 = 173995^2 + 28716^2 .

It is a cyclic number.

It is not a de Polignac number, because 31098868681 - 2¹⁹ = 31098344393 is a prime.

It is a super-2 number, since 2×31098868681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31018868681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15549434340 + 15549434341.

It is an arithmetic number, because the mean of its divisors is an integer number (15549434341).

Almost surely, 2^31098868681 is an apocalyptic number.

It is an amenable number.

31098868681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31098868681 is an equidigital number, since it uses as much as digits as its factorization.

31098868681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3981312, while the sum is 58.

The spelling of 31098868681 in words is "thirty-one billion, ninety-eight million, eight hundred sixty-eight thousand, six hundred eighty-one".