81417473 has 4 divisors (see below), whose sum is σ = 81541680. Its totient is φ = 81293268.

The previous prime is 81417461. The next prime is 81417491. The reversal of 81417473 is 37471418.

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 81417473 - 2¹⁰ = 81416449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81417073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61115 + ... + 62432.

It is an arithmetic number, because the mean of its divisors is an integer number (20385420).

Almost surely, 2^81417473 is an apocalyptic number.

It is an amenable number.

81417473 is a deficient number, since it is larger than the sum of its proper divisors (124207).

81417473 is a wasteful number, since it uses less digits than its factorization.

81417473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124206.

The product of its digits is 18816, while the sum is 35.

The square root of 81417473 is about 9023.1631371709. The cubic root of 81417473 is about 433.4169313401.

The spelling of 81417473 in words is "eighty-one million, four hundred seventeen thousand, four hundred seventy-three".