81099883 has 4 divisors (see below), whose sum is σ = 81364360. Its totient is φ = 80835408.

The previous prime is 81099859. The next prime is 81099913. The reversal of 81099883 is 38899018.

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

It is a cyclic number.

It is not a de Polignac number, because 81099883 - 2⁹ = 81099371 is a prime.

It is a super-2 number, since 2×81099883² = 13154382045227378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81099803) 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, 131778 + ... + 132391.

It is an arithmetic number, because the mean of its divisors is an integer number (20341090).

Almost surely, 2^81099883 is an apocalyptic number.

81099883 is a deficient number, since it is larger than the sum of its proper divisors (264477).

81099883 is a wasteful number, since it uses less digits than its factorization.

81099883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264476.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 81099883 is about 9005.5473459418. The cubic root of 81099883 is about 432.8526452173.

The spelling of 81099883 in words is "eighty-one million, ninety-nine thousand, eight hundred eighty-three".