81992335 has 4 divisors (see below), whose sum is σ = 98390808. Its totient is φ = 65593864.

The previous prime is 81992329. The next prime is 81992399. The reversal of 81992335 is 53329918.

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 81992335 - 2¹¹ = 81990287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8199229 + ... + 8199238.

It is an arithmetic number, because the mean of its divisors is an integer number (24597702).

Almost surely, 2^81992335 is an apocalyptic number.

81992335 is a deficient number, since it is larger than the sum of its proper divisors (16398473).

81992335 is a wasteful number, since it uses less digits than its factorization.

81992335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16398472.

The product of its digits is 58320, while the sum is 40.

The square root of 81992335 is about 9054.9618994229. The cubic root of 81992335 is about 434.4346113865.

The spelling of 81992335 in words is "eighty-one million, nine hundred ninety-two thousand, three hundred thirty-five".