117821601 has 16 divisors (see below), whose sum is σ = 175728000. Its totient is φ = 78017904.

The previous prime is 117821593. The next prime is 117821623. The reversal of 117821601 is 106128711.

It is not a de Polignac number, because 117821601 - 2³ = 117821593 is a prime.

It is a super-3 number, since 3×117821601³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (117821681) 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 15 ways as a sum of consecutive naturals, for example, 10621 + ... + 18666.

It is an arithmetic number, because the mean of its divisors is an integer number (10983000).

Almost surely, 2^117821601 is an apocalyptic number.

It is an amenable number.

117821601 is a deficient number, since it is larger than the sum of its proper divisors (57906399).

117821601 is a wasteful number, since it uses less digits than its factorization.

117821601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29445 (or 29439 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 117821601 is about 10854.5659056454. The cubic root of 117821601 is about 490.2395066805.

The spelling of 117821601 in words is "one hundred seventeen million, eight hundred twenty-one thousand, six hundred one".