117961805 has 16 divisors (see below), whose sum is σ = 152670000. Its totient is φ = 86980608.

The previous prime is 117961799. The next prime is 117961807. The reversal of 117961805 is 508169711.

It can be written as a sum of positive squares in 8 ways, for example, as 484 + 117961321 = 22^2 + 10861^2 .

It is not a de Polignac number, because 117961805 - 2¹⁶ = 117896269 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117961807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80459 + ... + 81911.

It is an arithmetic number, because the mean of its divisors is an integer number (9541875).

Almost surely, 2^117961805 is an apocalyptic number.

It is an amenable number.

117961805 is a deficient number, since it is larger than the sum of its proper divisors (34708195).

117961805 is a wasteful number, since it uses less digits than its factorization.

117961805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 117961805 is about 10861.0222815350. The cubic root of 117961805 is about 490.4338861312.

The spelling of 117961805 in words is "one hundred seventeen million, nine hundred sixty-one thousand, eight hundred five".