117840561 has 8 divisors (see below), whose sum is σ = 157705920. Its totient is φ = 78267792.

The previous prime is 117840553. The next prime is 117840563. The reversal of 117840561 is 165048711.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 117840561 - 2³ = 117840553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117840563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72205 + ... + 73818.

It is an arithmetic number, because the mean of its divisors is an integer number (19713240).

Almost surely, 2^117840561 is an apocalyptic number.

It is an amenable number.

117840561 is a deficient number, since it is larger than the sum of its proper divisors (39865359).

117840561 is a wasteful number, since it uses less digits than its factorization.

117840561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146295.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 117840561 is about 10855.4392357012. The cubic root of 117840561 is about 490.2658019225.

The spelling of 117840561 in words is "one hundred seventeen million, eight hundred forty thousand, five hundred sixty-one".