81407701 has 4 divisors (see below), whose sum is σ = 81431532. Its totient is φ = 81383872.

The previous prime is 81407699. The next prime is 81407707. The reversal of 81407701 is 10770418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34210801 + 47196900 = 5849^2 + 6870^2 .

It is a cyclic number.

It is not a de Polignac number, because 81407701 - 2¹ = 81407699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81407701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81407707) 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, 5716 + ... + 13981.

It is an arithmetic number, because the mean of its divisors is an integer number (20357883).

Almost surely, 2^81407701 is an apocalyptic number.

It is an amenable number.

81407701 is a deficient number, since it is larger than the sum of its proper divisors (23831).

81407701 is a wasteful number, since it uses less digits than its factorization.

81407701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23830.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 81407701 is about 9022.6216256696. The cubic root of 81407701 is about 433.3995905919.

The spelling of 81407701 in words is "eighty-one million, four hundred seven thousand, seven hundred one".