80999523 has 48 divisors (see below), whose sum is σ = 133941600. Its totient is φ = 46717440.

The previous prime is 80999483. The next prime is 80999551. The reversal of 80999523 is 32599908.

It is not a de Polignac number, because 80999523 - 2⁶ = 80999459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80999563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 255361 + ... + 255677.

It is an arithmetic number, because the mean of its divisors is an integer number (2790450).

Almost surely, 2^80999523 is an apocalyptic number.

80999523 is a deficient number, since it is larger than the sum of its proper divisors (52942077).

80999523 is a wasteful number, since it uses less digits than its factorization.

80999523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 80999523 is about 8999.9734999610. The cubic root of 80999523 is about 432.6740217658.

It can be divided in two parts, 809995 and 23, that added together give a palindrome (810018).

The spelling of 80999523 in words is "eighty million, nine hundred ninety-nine thousand, five hundred twenty-three".