161693817 has 8 divisors (see below), whose sum is σ = 228273696. Its totient is φ = 101454912.

The previous prime is 161693813. The next prime is 161693849. The reversal of 161693817 is 718396161.

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

It is not a de Polignac number, because 161693817 - 2² = 161693813 is a prime.

It is a super-2 number, since 2×161693817² = 52289780912058978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161693813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1585183 + ... + 1585284.

It is an arithmetic number, because the mean of its divisors is an integer number (28534212).

Almost surely, 2^161693817 is an apocalyptic number.

161693817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161693817 is a deficient number, since it is larger than the sum of its proper divisors (66579879).

161693817 is a wasteful number, since it uses less digits than its factorization.

161693817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170487.

The product of its digits is 54432, while the sum is 42.

The square root of 161693817 is about 12715.8883684940. Note that the first 3 decimals coincide. The cubic root of 161693817 is about 544.7925220963.

The spelling of 161693817 in words is "one hundred sixty-one million, six hundred ninety-three thousand, eight hundred seventeen".