117540643 has 4 divisors (see below), whose sum is σ = 128226168. Its totient is φ = 106855120.

The previous prime is 117540637. The next prime is 117540671. The reversal of 117540643 is 346045711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346045711 = 11 ⋅31458701.

It is a cyclic number.

It is not a de Polignac number, because 117540643 - 2⁵ = 117540611 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117540673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5342746 + ... + 5342767.

It is an arithmetic number, because the mean of its divisors is an integer number (32056542).

Almost surely, 2^117540643 is an apocalyptic number.

117540643 is a deficient number, since it is larger than the sum of its proper divisors (10685525).

117540643 is a wasteful number, since it uses less digits than its factorization.

117540643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10685524.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 117540643 is about 10841.6162540463. The cubic root of 117540643 is about 489.8495206396.

The spelling of 117540643 in words is "one hundred seventeen million, five hundred forty thousand, six hundred forty-three".