117841561 has 4 divisors (see below), whose sum is σ = 118942992. Its totient is φ = 116740132.

The previous prime is 117841523. The next prime is 117841597. The reversal of 117841561 is 165148711.

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 117841561 - 2⁹ = 117841049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117841861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550555 + ... + 550768.

It is an arithmetic number, because the mean of its divisors is an integer number (29735748).

Almost surely, 2^117841561 is an apocalyptic number.

It is an amenable number.

117841561 is a deficient number, since it is larger than the sum of its proper divisors (1101431).

117841561 is a wasteful number, since it uses less digits than its factorization.

117841561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101430.

The product of its digits is 6720, while the sum is 34.

The square root of 117841561 is about 10855.4852954624. The cubic root of 117841561 is about 490.2671887240.

The spelling of 117841561 in words is "one hundred seventeen million, eight hundred forty-one thousand, five hundred sixty-one".