161598217 has 8 divisors (see below), whose sum is σ = 178107552. Its totient is φ = 145392000.

The previous prime is 161598193. The next prime is 161598221. The reversal of 161598217 is 712895161.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161598217 is a prime.

It is a super-2 number, since 2×161598217² = 52227967475158178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161598217.

It is not an unprimeable number, because it can be changed into a prime (161598317) 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, 74659 + ... + 76792.

It is an arithmetic number, because the mean of its divisors is an integer number (22263444).

Almost surely, 2^161598217 is an apocalyptic number.

It is an amenable number.

161598217 is a deficient number, since it is larger than the sum of its proper divisors (16509335).

161598217 is a wasteful number, since it uses less digits than its factorization.

161598217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151559.

The product of its digits is 30240, while the sum is 40.

The square root of 161598217 is about 12712.1287359749. The cubic root of 161598217 is about 544.6851330532.

The spelling of 161598217 in words is "one hundred sixty-one million, five hundred ninety-eight thousand, two hundred seventeen".