161198074 has 4 divisors (see below), whose sum is σ = 241797114. Its totient is φ = 80599036.

The previous prime is 161198041. The next prime is 161198083. The reversal of 161198074 is 470891161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 470891161 = 13 ⋅36222397.

It can be written as a sum of positive squares in only one way, i.e., 121947849 + 39250225 = 11043^2 + 6265^2 .

It is a super-2 number, since 2×161198074² = 51969638122618952, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40299517 + ... + 40299520.

Almost surely, 2^161198074 is an apocalyptic number.

161198074 is a deficient number, since it is larger than the sum of its proper divisors (80599040).

161198074 is an equidigital number, since it uses as much as digits as its factorization.

161198074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80599039.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 161198074 is about 12696.3803503203. The cubic root of 161198074 is about 544.2351856678.

The spelling of 161198074 in words is "one hundred sixty-one million, one hundred ninety-eight thousand, seventy-four".