81673417 has 4 divisors (see below), whose sum is σ = 93341056. Its totient is φ = 70005780.

The previous prime is 81673409. The next prime is 81673429. The reversal of 81673417 is 71437618.

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 81673417 - 2³ = 81673409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81673447) 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, 5833809 + ... + 5833822.

It is an arithmetic number, because the mean of its divisors is an integer number (23335264).

Almost surely, 2^81673417 is an apocalyptic number.

It is an amenable number.

81673417 is a deficient number, since it is larger than the sum of its proper divisors (11667639).

81673417 is a wasteful number, since it uses less digits than its factorization.

81673417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11667638.

The product of its digits is 28224, while the sum is 37.

The square root of 81673417 is about 9037.3346181272. The cubic root of 81673417 is about 433.8706194787.

The spelling of 81673417 in words is "eighty-one million, six hundred seventy-three thousand, four hundred seventeen".