117853661 has 4 divisors (see below), whose sum is σ = 121655424. Its totient is φ = 114051900.

The previous prime is 117853657. The next prime is 117853667. The reversal of 117853661 is 166358711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166358711 = 89 ⋅1869199.

It is a cyclic number.

It is not a de Polignac number, because 117853661 - 2² = 117853657 is a prime.

It is a super-2 number, since 2×117853661² = 27778970822205842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117853667) 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, 1900835 + ... + 1900896.

It is an arithmetic number, because the mean of its divisors is an integer number (30413856).

Almost surely, 2^117853661 is an apocalyptic number.

It is an amenable number.

117853661 is a deficient number, since it is larger than the sum of its proper divisors (3801763).

117853661 is an equidigital number, since it uses as much as digits as its factorization.

117853661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801762.

The product of its digits is 30240, while the sum is 38.

The square root of 117853661 is about 10856.0426030852. The cubic root of 117853661 is about 490.2839684009.

The spelling of 117853661 in words is "one hundred seventeen million, eight hundred fifty-three thousand, six hundred sixty-one".