81474499 has 4 divisors (see below), whose sum is σ = 81542664. Its totient is φ = 81406336.

The previous prime is 81474461. The next prime is 81474511. The reversal of 81474499 is 99447418.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81474499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81474599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32257 + ... + 34690.

It is an arithmetic number, because the mean of its divisors is an integer number (20385666).

Almost surely, 2^81474499 is an apocalyptic number.

81474499 is a deficient number, since it is larger than the sum of its proper divisors (68165).

81474499 is a wasteful number, since it uses less digits than its factorization.

81474499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68164.

The product of its digits is 290304, while the sum is 46.

The square root of 81474499 is about 9026.3225623728. The cubic root of 81474499 is about 433.5180982632.

The spelling of 81474499 in words is "eighty-one million, four hundred seventy-four thousand, four hundred ninety-nine".