117771839 has 2 divisors, whose sum is σ = 117771840. Its totient is φ = 117771838.

The previous prime is 117771833. The next prime is 117771853. The reversal of 117771839 is 938177711.

It is a weak prime.

It is an emirp because it is prime and its reverse (938177711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117771839 - 2²⁴ = 100994623 is a prime.

It is a super-2 number, since 2×117771839² = 27740412122883842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 117771839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117771833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58885919 + 58885920.

It is an arithmetic number, because the mean of its divisors is an integer number (58885920).

Almost surely, 2^117771839 is an apocalyptic number.

117771839 is a deficient number, since it is larger than the sum of its proper divisors (1).

117771839 is an equidigital number, since it uses as much as digits as its factorization.

117771839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 44.

The square root of 117771839 is about 10852.2734484531. The cubic root of 117771839 is about 490.1704793449.

The spelling of 117771839 in words is "one hundred seventeen million, seven hundred seventy-one thousand, eight hundred thirty-nine".