117990261989 has 2 divisors, whose sum is σ = 117990261990. Its totient is φ = 117990261988.

The previous prime is 117990261979. The next prime is 117990262001. The reversal of 117990261989 is 989162099711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115220871364 + 2769390625 = 339442^2 + 52625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117990261989 is a prime.

It is a super-2 number, since 2×117990261989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117990261919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58995130994 + 58995130995.

It is an arithmetic number, because the mean of its divisors is an integer number (58995130995).

Almost surely, 2^117990261989 is an apocalyptic number.

It is an amenable number.

117990261989 is a deficient number, since it is larger than the sum of its proper divisors (1).

117990261989 is an equidigital number, since it uses as much as digits as its factorization.

117990261989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 62.

The spelling of 117990261989 in words is "one hundred seventeen billion, nine hundred ninety million, two hundred sixty-one thousand, nine hundred eighty-nine".