81696007 has 2 divisors, whose sum is σ = 81696008. Its totient is φ = 81696006.

The previous prime is 81695989. The next prime is 81696047. The reversal of 81696007 is 70069618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81696007 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81696047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40848003 + 40848004.

It is an arithmetic number, because the mean of its divisors is an integer number (40848004).

Almost surely, 2^81696007 is an apocalyptic number.

81696007 is a deficient number, since it is larger than the sum of its proper divisors (1).

81696007 is an equidigital number, since it uses as much as digits as its factorization.

81696007 is an evil number, because the sum of its binary digits is even.

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

The square root of 81696007 is about 9038.5843471199. The cubic root of 81696007 is about 433.9106171269.

The spelling of 81696007 in words is "eighty-one million, six hundred ninety-six thousand, seven".