117961919 has 2 divisors, whose sum is σ = 117961920. Its totient is φ = 117961918.

The previous prime is 117961903. The next prime is 117961939. The reversal of 117961919 is 919169711.

It is a weak prime.

It is an emirp because it is prime and its reverse (919169711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117961919 - 2⁴ = 117961903 is a prime.

It is a super-2 number, since 2×117961919² = 27830028668325122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117961919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117961939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58980959 + 58980960.

It is an arithmetic number, because the mean of its divisors is an integer number (58980960).

Almost surely, 2^117961919 is an apocalyptic number.

117961919 is a deficient number, since it is larger than the sum of its proper divisors (1).

117961919 is an equidigital number, since it uses as much as digits as its factorization.

117961919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 44.

The square root of 117961919 is about 10861.0275296585. The cubic root of 117961919 is about 490.4340441186.

The spelling of 117961919 in words is "one hundred seventeen million, nine hundred sixty-one thousand, nine hundred nineteen".