81083577 has 4 divisors (see below), whose sum is σ = 108111440. Its totient is φ = 54055716.

The previous prime is 81083573. The next prime is 81083603. The reversal of 81083577 is 77538018.

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 not a de Polignac number, because 81083577 - 2² = 81083573 is a prime.

It is a super-2 number, since 2×81083577² = 13149092918229858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81083573) 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, 13513927 + ... + 13513932.

It is an arithmetic number, because the mean of its divisors is an integer number (27027860).

Almost surely, 2^81083577 is an apocalyptic number.

It is an amenable number.

81083577 is a deficient number, since it is larger than the sum of its proper divisors (27027863).

81083577 is a wasteful number, since it uses less digits than its factorization.

81083577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27027862.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 81083577 is about 9004.6419695621. The cubic root of 81083577 is about 432.8236333862.

The spelling of 81083577 in words is "eighty-one million, eighty-three thousand, five hundred seventy-seven".