81038701 has 2 divisors, whose sum is σ = 81038702. Its totient is φ = 81038700.

The previous prime is 81038693. The next prime is 81038717. The reversal of 81038701 is 10783018.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65593801 + 15444900 = 8099^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 81038701 - 2³ = 81038693 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81038701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81038791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40519350 + 40519351.

It is an arithmetic number, because the mean of its divisors is an integer number (40519351).

Almost surely, 2^81038701 is an apocalyptic number.

It is an amenable number.

81038701 is a deficient number, since it is larger than the sum of its proper divisors (1).

81038701 is an equidigital number, since it uses as much as digits as its factorization.

81038701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81038701 is about 9002.1497987981. The cubic root of 81038701 is about 432.7437693804.

The spelling of 81038701 in words is "eighty-one million, thirty-eight thousand, seven hundred one".