117538561 has 16 divisors (see below), whose sum is σ = 144650880. Its totient is φ = 93208320.

The previous prime is 117538543. The next prime is 117538567. The reversal of 117538561 is 165835711.

It is a cyclic number.

It is not a de Polignac number, because 117538561 - 2¹⁷ = 117407489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117538561.

It is not an unprimeable number, because it can be changed into a prime (117538567) 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, 1350 + ... + 15391.

It is an arithmetic number, because the mean of its divisors is an integer number (9040680).

Almost surely, 2^117538561 is an apocalyptic number.

It is an amenable number.

117538561 is a deficient number, since it is larger than the sum of its proper divisors (27112319).

117538561 is a wasteful number, since it uses less digits than its factorization.

117538561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16824.

The product of its digits is 25200, while the sum is 37.

The square root of 117538561 is about 10841.5202347272. The cubic root of 117538561 is about 489.8466283840.

The spelling of 117538561 in words is "one hundred seventeen million, five hundred thirty-eight thousand, five hundred sixty-one".