117881287 has 4 divisors (see below), whose sum is σ = 119096656. Its totient is φ = 116665920.

The previous prime is 117881249. The next prime is 117881293. The reversal of 117881287 is 782188711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782188711 = 47 ⋅16642313.

It is a cyclic number.

It is not a de Polignac number, because 117881287 - 2¹¹ = 117879239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117881887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607539 + ... + 607732.

It is an arithmetic number, because the mean of its divisors is an integer number (29774164).

Almost surely, 2^117881287 is an apocalyptic number.

117881287 is a deficient number, since it is larger than the sum of its proper divisors (1215369).

117881287 is an equidigital number, since it uses as much as digits as its factorization.

117881287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215368.

The product of its digits is 50176, while the sum is 43.

The square root of 117881287 is about 10857.3149074714. The cubic root of 117881287 is about 490.3222744566.

The spelling of 117881287 in words is "one hundred seventeen million, eight hundred eighty-one thousand, two hundred eighty-seven".