81069897 has 8 divisors (see below), whose sum is σ = 108435456. Its totient is φ = 53875472.

The previous prime is 81069881. The next prime is 81069899. The reversal of 81069897 is 79896018.

It is a happy number.

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 81069897 - 2⁴ = 81069881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81069899) 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, 41673 + ... + 43574.

It is an arithmetic number, because the mean of its divisors is an integer number (13554432).

Almost surely, 2^81069897 is an apocalyptic number.

It is an amenable number.

81069897 is a deficient number, since it is larger than the sum of its proper divisors (27365559).

81069897 is a wasteful number, since it uses less digits than its factorization.

81069897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85567.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 81069897 is about 9003.8823293066. The cubic root of 81069897 is about 432.7992907653.

Adding to 81069897 its product of nonzero digits (217728), we get a triangular number (81287625 = T₁₂₇₅₀).

It can be divided in two parts, 810 and 69897, that added together give a palindrome (70707).

The spelling of 81069897 in words is "eighty-one million, sixty-nine thousand, eight hundred ninety-seven".