161028986 has 4 divisors (see below), whose sum is σ = 241543482. Its totient is φ = 80514492.

The previous prime is 161028961. The next prime is 161028997. The reversal of 161028986 is 689820161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 153636025 + 7392961 = 12395^2 + 2719^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40257245 + ... + 40257248.

Almost surely, 2^161028986 is an apocalyptic number.

161028986 is a deficient number, since it is larger than the sum of its proper divisors (80514496).

161028986 is an equidigital number, since it uses as much as digits as its factorization.

161028986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80514495.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 161028986 is about 12689.7196974559. The cubic root of 161028986 is about 544.0448280713.

The spelling of 161028986 in words is "one hundred sixty-one million, twenty-eight thousand, nine hundred eighty-six".