80991523 has 8 divisors (see below), whose sum is σ = 83578320. Its totient is φ = 78433920.

The previous prime is 80991517. The next prime is 80991539. The reversal of 80991523 is 32519908.

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-80991523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80991503) 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, 1593 + ... + 12826.

It is an arithmetic number, because the mean of its divisors is an integer number (10447290).

Almost surely, 2^80991523 is an apocalyptic number.

80991523 is a deficient number, since it is larger than the sum of its proper divisors (2586797).

80991523 is a wasteful number, since it uses less digits than its factorization.

80991523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14597.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 80991523 is about 8999.5290432333. The cubic root of 80991523 is about 432.6597768007.

The spelling of 80991523 in words is "eighty million, nine hundred ninety-one thousand, five hundred twenty-three".