81600967 has 4 divisors (see below), whose sum is σ = 93258256. Its totient is φ = 69943680.

The previous prime is 81600943. The next prime is 81600989. The reversal of 81600967 is 76900618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76900618 = 2 ⋅38450309.

It is a cyclic number.

It is not a de Polignac number, because 81600967 - 2¹¹ = 81598919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81600667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5828634 + ... + 5828647.

It is an arithmetic number, because the mean of its divisors is an integer number (23314564).

Almost surely, 2^81600967 is an apocalyptic number.

81600967 is a deficient number, since it is larger than the sum of its proper divisors (11657289).

81600967 is a wasteful number, since it uses less digits than its factorization.

81600967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11657288.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 81600967 is about 9033.3253567000. The cubic root of 81600967 is about 433.7422903894.

The spelling of 81600967 in words is "eighty-one million, six hundred thousand, nine hundred sixty-seven".