117191865 has 32 divisors (see below), whose sum is σ = 215688960. Its totient is φ = 53224704.

The previous prime is 117191861. The next prime is 117191869. The reversal of 117191865 is 568191711.

It is an interprime number because it is at equal distance from previous prime (117191861) and next prime (117191869).

It is not a de Polignac number, because 117191865 - 2² = 117191861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117191861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12931 + ... + 20039.

It is an arithmetic number, because the mean of its divisors is an integer number (6740280).

Almost surely, 2^117191865 is an apocalyptic number.

117191865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

117191865 is a deficient number, since it is larger than the sum of its proper divisors (98497095).

117191865 is a wasteful number, since it uses less digits than its factorization.

117191865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7281.

The product of its digits is 15120, while the sum is 39.

The square root of 117191865 is about 10825.5191561421. The cubic root of 117191865 is about 489.3645309453.

The spelling of 117191865 in words is "one hundred seventeen million, one hundred ninety-one thousand, eight hundred sixty-five".