81600307 has 4 divisors (see below), whose sum is σ = 85895080. Its totient is φ = 77305536.

The previous prime is 81600271. The next prime is 81600313. The reversal of 81600307 is 70300618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70300618 = 2 ⋅35150309.

It is a cyclic number.

It is not a de Polignac number, because 81600307 - 2¹¹ = 81598259 is a prime.

It is a super-2 number, since 2×81600307² = 13317220204988498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81600317) 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, 2147358 + ... + 2147395.

It is an arithmetic number, because the mean of its divisors is an integer number (21473770).

Almost surely, 2^81600307 is an apocalyptic number.

81600307 is a deficient number, since it is larger than the sum of its proper divisors (4294773).

81600307 is a wasteful number, since it uses less digits than its factorization.

81600307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4294772.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 81600307 is about 9033.2888252286. The cubic root of 81600307 is about 433.7411209969.

The spelling of 81600307 in words is "eighty-one million, six hundred thousand, three hundred seven".