117801821 has 8 divisors (see below), whose sum is σ = 122164224. Its totient is φ = 113501520.

The previous prime is 117801781. The next prime is 117801833. The reversal of 117801821 is 128108711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 117801821 - 2¹⁸ = 117539677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117801421) 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 7 ways as a sum of consecutive naturals, for example, 11645 + ... + 19266.

It is an arithmetic number, because the mean of its divisors is an integer number (15270528).

Almost surely, 2^117801821 is an apocalyptic number.

It is an amenable number.

117801821 is a deficient number, since it is larger than the sum of its proper divisors (4362403).

117801821 is a wasteful number, since it uses less digits than its factorization.

117801821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31051.

The product of its (nonzero) digits is 896, while the sum is 29.

The square root of 117801821 is about 10853.6547300898. The cubic root of 117801821 is about 490.2120711903.

The spelling of 117801821 in words is "one hundred seventeen million, eight hundred one thousand, eight hundred twenty-one".