1980161 has 8 divisors (see below), whose sum is σ = 2109600. Its totient is φ = 1853280.

The previous prime is 1980113. The next prime is 1980169. The reversal of 1980161 is 1610891.

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-1980161 is a prime.

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 1980161.

It is not an unprimeable number, because it can be changed into a prime (1980169) 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, 1106 + ... + 2276.

It is an arithmetic number, because the mean of its divisors is an integer number (263700).

2^1980161 is an apocalyptic number.

It is an amenable number.

1980161 is a deficient number, since it is larger than the sum of its proper divisors (129439).

1980161 is a wasteful number, since it uses less digits than its factorization.

1980161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1980161 is about 1407.1819356430. The cubic root of 1980161 is about 125.5741269884.

The spelling of 1980161 in words is "one million, nine hundred eighty thousand, one hundred sixty-one".