81492835 has 4 divisors (see below), whose sum is σ = 97791408. Its totient is φ = 65194264.

The previous prime is 81492823. The next prime is 81492857. The reversal of 81492835 is 53829418.

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 81492835 - 2²⁵ = 47938403 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8149279 + ... + 8149288.

It is an arithmetic number, because the mean of its divisors is an integer number (24447852).

Almost surely, 2^81492835 is an apocalyptic number.

81492835 is a deficient number, since it is larger than the sum of its proper divisors (16298573).

81492835 is a wasteful number, since it uses less digits than its factorization.

81492835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16298572.

The product of its digits is 69120, while the sum is 40.

The square root of 81492835 is about 9027.3382012640. The cubic root of 81492835 is about 433.5506171974.

The spelling of 81492835 in words is "eighty-one million, four hundred ninety-two thousand, eight hundred thirty-five".