81050799 has 4 divisors (see below), whose sum is σ = 108067736. Its totient is φ = 54033864.

The previous prime is 81050777. The next prime is 81050807. The reversal of 81050799 is 99705018.

It is a happy number.

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

It is not a de Polignac number, because 81050799 - 2¹² = 81046703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81050699) 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, 13508464 + ... + 13508469.

It is an arithmetic number, because the mean of its divisors is an integer number (27016934).

Almost surely, 2^81050799 is an apocalyptic number.

81050799 is a deficient number, since it is larger than the sum of its proper divisors (27016937).

81050799 is a wasteful number, since it uses less digits than its factorization.

81050799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27016936.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 81050799 is about 9002.8217243262. The cubic root of 81050799 is about 432.7653026049.

The spelling of 81050799 in words is "eighty-one million, fifty thousand, seven hundred ninety-nine".