81797371 has 8 divisors (see below), whose sum is σ = 84733920. Its totient is φ = 78868608.

The previous prime is 81797363. The next prime is 81797381. The reversal of 81797371 is 17379718.

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

It is a cyclic number.

It is not a de Polignac number, because 81797371 - 2³ = 81797363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81797321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26890 + ... + 29776.

It is an arithmetic number, because the mean of its divisors is an integer number (10591740).

Almost surely, 2^81797371 is an apocalyptic number.

81797371 is a deficient number, since it is larger than the sum of its proper divisors (2936549).

81797371 is a wasteful number, since it uses less digits than its factorization.

81797371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3893.

The product of its digits is 74088, while the sum is 43.

The square root of 81797371 is about 9044.1899029156. The cubic root of 81797371 is about 434.0900005892.

The spelling of 81797371 in words is "eighty-one million, seven hundred ninety-seven thousand, three hundred seventy-one".