81600719 has 2 divisors, whose sum is σ = 81600720. Its totient is φ = 81600718.

The previous prime is 81600689. The next prime is 81600781. The reversal of 81600719 is 91700618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81600719 is a prime.

It is a super-2 number, since 2×81600719² = 13317354682633922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81600419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40800359 + 40800360.

It is an arithmetic number, because the mean of its divisors is an integer number (40800360).

Almost surely, 2^81600719 is an apocalyptic number.

81600719 is a deficient number, since it is larger than the sum of its proper divisors (1).

81600719 is an equidigital number, since it uses as much as digits as its factorization.

81600719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 81600719 is about 9033.3116297402. The cubic root of 81600719 is about 433.7418509821.

The spelling of 81600719 in words is "eighty-one million, six hundred thousand, seven hundred nineteen".