126990108697 has 2 divisors, whose sum is σ = 126990108698. Its totient is φ = 126990108696.

The previous prime is 126990108659. The next prime is 126990108769. The reversal of 126990108697 is 796801099621.

Together with next prime (126990108769) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89557146121 + 37432962576 = 299261^2 + 193476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126990108697 is a prime.

It is a super-2 number, since 2×126990108697² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126990108607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63495054348 + 63495054349.

It is an arithmetic number, because the mean of its divisors is an integer number (63495054349).

Almost surely, 2^126990108697 is an apocalyptic number.

It is an amenable number.

126990108697 is a deficient number, since it is larger than the sum of its proper divisors (1).

126990108697 is an equidigital number, since it uses as much as digits as its factorization.

126990108697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 58.

The spelling of 126990108697 in words is "one hundred twenty-six billion, nine hundred ninety million, one hundred eight thousand, six hundred ninety-seven".