81476873 has 4 divisors (see below), whose sum is σ = 83371728. Its totient is φ = 79582020.

The previous prime is 81476851. The next prime is 81476893. The reversal of 81476873 is 37867418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81476873 - 2⁶ = 81476809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81476893) 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, 947363 + ... + 947448.

It is an arithmetic number, because the mean of its divisors is an integer number (20842932).

Almost surely, 2^81476873 is an apocalyptic number.

It is an amenable number.

81476873 is a deficient number, since it is larger than the sum of its proper divisors (1894855).

81476873 is a wasteful number, since it uses less digits than its factorization.

81476873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894854.

The product of its digits is 225792, while the sum is 44.

The square root of 81476873 is about 9026.4540656894. The cubic root of 81476873 is about 433.5223088321.

The spelling of 81476873 in words is "eighty-one million, four hundred seventy-six thousand, eight hundred seventy-three".