80861019 has 16 divisors (see below), whose sum is σ = 112039200. Its totient is φ = 51812096.

The previous prime is 80860999. The next prime is 80861029. The reversal of 80861019 is 91016808.

It is not a de Polignac number, because 80861019 - 2²⁰ = 79812443 is a prime.

It is a super-2 number, since 2×80861019² = 13077008787436722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80861029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18277 + ... + 22265.

It is an arithmetic number, because the mean of its divisors is an integer number (7002450).

Almost surely, 2^80861019 is an apocalyptic number.

80861019 is a deficient number, since it is larger than the sum of its proper divisors (31178181).

80861019 is a wasteful number, since it uses less digits than its factorization.

80861019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 80861019 is about 8992.2755184658. The cubic root of 80861019 is about 432.4272661055.

The spelling of 80861019 in words is "eighty million, eight hundred sixty-one thousand, nineteen".