81795497 has 8 divisors (see below), whose sum is σ = 93614976. Its totient is φ = 70009632.

The previous prime is 81795491. The next prime is 81795509. The reversal of 81795497 is 79459718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81795497 - 2¹² = 81791401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81795491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2948 + ... + 13125.

It is an arithmetic number, because the mean of its divisors is an integer number (11701872).

Almost surely, 2^81795497 is an apocalyptic number.

It is an amenable number.

81795497 is a deficient number, since it is larger than the sum of its proper divisors (11819479).

81795497 is a wasteful number, since it uses less digits than its factorization.

81795497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16807.

The product of its digits is 635040, while the sum is 50.

The square root of 81795497 is about 9044.0862998979. The cubic root of 81795497 is about 434.0866855239.

The spelling of 81795497 in words is "eighty-one million, seven hundred ninety-five thousand, four hundred ninety-seven".