117881897 has 20 divisors (see below), whose sum is σ = 142346820. Its totient is φ = 97499808.

The previous prime is 117881887. The next prime is 117881903. The reversal of 117881897 is 798188711.

It can be written as a sum of positive squares in 2 ways, for example, as 53304601 + 64577296 = 7301^2 + 8036^2 .

It is not a de Polignac number, because 117881897 - 2¹⁴ = 117865513 is a prime.

It is a super-2 number, since 2×117881897² = 27792283280637218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117881867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 68783 + ... + 70475.

It is an arithmetic number, because the mean of its divisors is an integer number (7117341).

Almost surely, 2^117881897 is an apocalyptic number.

It is an amenable number.

117881897 is a deficient number, since it is larger than the sum of its proper divisors (24464923).

117881897 is an frugal number, since it uses more digits than its factorization.

117881897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750 (or 1729 counting only the distinct ones).

The product of its digits is 225792, while the sum is 50.

The square root of 117881897 is about 10857.3429990951. The cubic root of 117881897 is about 490.3231202117.

The spelling of 117881897 in words is "one hundred seventeen million, eight hundred eighty-one thousand, eight hundred ninety-seven".