1980005111 has 24 divisors (see below), whose sum is σ = 2331535584. Its totient is φ = 1646985600.

The previous prime is 1980005107. The next prime is 1980005171. The reversal of 1980005111 is 1115000891.

It is not a de Polignac number, because 1980005111 - 2² = 1980005107 is a prime.

It is a super-2 number, since 2×1980005111² = 7840840479172244642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980005171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1985465 + ... + 1986461.

It is an arithmetic number, because the mean of its divisors is an integer number (97147316).

Almost surely, 2^1980005111 is an apocalyptic number.

1980005111 is a deficient number, since it is larger than the sum of its proper divisors (351530473).

1980005111 is an equidigital number, since it uses as much as digits as its factorization.

1980005111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 1980005111 is about 44497.2483531285. The cubic root of 1980005111 is about 1255.7083161008.

The spelling of 1980005111 in words is "one billion, nine hundred eighty million, five thousand, one hundred eleven".