161499198 has 48 divisors (see below), whose sum is σ = 377305344. Its totient is φ = 45949680.

The previous prime is 161499197. The next prime is 161499199. The reversal of 161499198 is 891994161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161499197) and next prime (161499199).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161499193) 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 23 ways as a sum of consecutive naturals, for example, 78661 + ... + 80687.

It is an arithmetic number, because the mean of its divisors is an integer number (7860528).

Almost surely, 2^161499198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161499198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188652672).

161499198 is an abundant number, since it is smaller than the sum of its proper divisors (215806146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161499198 is a wasteful number, since it uses less digits than its factorization.

161499198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317 (or 2310 counting only the distinct ones).

The product of its digits is 139968, while the sum is 48.

The square root of 161499198 is about 12708.2334728317. The cubic root of 161499198 is about 544.5738587294.

The spelling of 161499198 in words is "one hundred sixty-one million, four hundred ninety-nine thousand, one hundred ninety-eight".