81696701 has 2 divisors, whose sum is σ = 81696702. Its totient is φ = 81696700.

The previous prime is 81696697. The next prime is 81696721. The reversal of 81696701 is 10769618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 22791076 = 7675^2 + 4774^2 .

It is a cyclic number.

It is not a de Polignac number, because 81696701 - 2² = 81696697 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81696721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40848350 + 40848351.

It is an arithmetic number, because the mean of its divisors is an integer number (40848351).

Almost surely, 2^81696701 is an apocalyptic number.

It is an amenable number.

81696701 is a deficient number, since it is larger than the sum of its proper divisors (1).

81696701 is an equidigital number, since it uses as much as digits as its factorization.

81696701 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 38.

The square root of 81696701 is about 9038.6227380061. The cubic root of 81696701 is about 433.9118458002.

The spelling of 81696701 in words is "eighty-one million, six hundred ninety-six thousand, seven hundred one".