81397695 has 8 divisors (see below), whose sum is σ = 130236336. Its totient is φ = 43412096.

The previous prime is 81397663. The next prime is 81397699. The reversal of 81397695 is 59679318.

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 81397695 - 2⁵ = 81397663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81397699) 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, 2713242 + ... + 2713271.

It is an arithmetic number, because the mean of its divisors is an integer number (16279542).

Almost surely, 2^81397695 is an apocalyptic number.

81397695 is a deficient number, since it is larger than the sum of its proper divisors (48838641).

81397695 is a wasteful number, since it uses less digits than its factorization.

81397695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426521.

The product of its digits is 408240, while the sum is 48.

The square root of 81397695 is about 9022.0671134724. The cubic root of 81397695 is about 433.3818331646.

The spelling of 81397695 in words is "eighty-one million, three hundred ninety-seven thousand, six hundred ninety-five".