161532198 has 32 divisors (see below), whose sum is σ = 380077920. Its totient is φ = 50676480.

The previous prime is 161532191. The next prime is 161532199. The reversal of 161532198 is 891235161.

161532198 is a `hidden beast` number, since 1 + 615 + 32 + 1 + 9 + 8 = 666.

It is a super-2 number, since 2×161532198² = 52185301981422408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161532191) 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, 87063 + ... + 88898.

It is an arithmetic number, because the mean of its divisors is an integer number (11877435).

Almost surely, 2^161532198 is an apocalyptic number.

161532198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161532198 is an abundant number, since it is smaller than the sum of its proper divisors (218545722).

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

161532198 is a wasteful number, since it uses less digits than its factorization.

161532198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175989 (or 175983 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 161532198 is about 12709.5317773709. The cubic root of 161532198 is about 544.6109481054.

The spelling of 161532198 in words is "one hundred sixty-one million, five hundred thirty-two thousand, one hundred ninety-eight".