80919511 has 4 divisors (see below), whose sum is σ = 81001672. Its totient is φ = 80837352.

The previous prime is 80919493. The next prime is 80919533. The reversal of 80919511 is 11591908.

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

It is a cyclic number.

It is not a de Polignac number, because 80919511 - 2⁵ = 80919479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80919011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39585 + ... + 41578.

It is an arithmetic number, because the mean of its divisors is an integer number (20250418).

Almost surely, 2^80919511 is an apocalyptic number.

80919511 is a deficient number, since it is larger than the sum of its proper divisors (82161).

80919511 is an equidigital number, since it uses as much as digits as its factorization.

80919511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82160.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 80919511 is about 8995.5272774863. The cubic root of 80919511 is about 432.5315085023.

The spelling of 80919511 in words is "eighty million, nine hundred nineteen thousand, five hundred eleven".