117065561 has 4 divisors (see below), whose sum is σ = 122155392. Its totient is φ = 111975732.

The previous prime is 117065539. The next prime is 117065563. The reversal of 117065561 is 165560711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 117065561 - 2¹⁰ = 117064537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117065563) 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, 2544881 + ... + 2544926.

It is an arithmetic number, because the mean of its divisors is an integer number (30538848).

Almost surely, 2^117065561 is an apocalyptic number.

It is an amenable number.

117065561 is a deficient number, since it is larger than the sum of its proper divisors (5089831).

117065561 is an equidigital number, since it uses as much as digits as its factorization.

117065561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089830.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 117065561 is about 10819.6839602643. The cubic root of 117065561 is about 489.1886628908.

The spelling of 117065561 in words is "one hundred seventeen million, sixty-five thousand, five hundred sixty-one".