81059401 has 4 divisors (see below), whose sum is σ = 81697792. Its totient is φ = 80421012.

The previous prime is 81059399. The next prime is 81059413. The reversal of 81059401 is 10495018.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81059401 - 2¹ = 81059399 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 81059401.

It is not an unprimeable number, because it can be changed into a prime (81059441) 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, 319005 + ... + 319258.

It is an arithmetic number, because the mean of its divisors is an integer number (20424448).

Almost surely, 2^81059401 is an apocalyptic number.

It is an amenable number.

81059401 is a deficient number, since it is larger than the sum of its proper divisors (638391).

81059401 is a wasteful number, since it uses less digits than its factorization.

81059401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638390.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 81059401 is about 9003.2994507569. The cubic root of 81059401 is about 432.7806119973.

The spelling of 81059401 in words is "eighty-one million, fifty-nine thousand, four hundred one".