81059011 has 4 divisors (see below), whose sum is σ = 88428024. Its totient is φ = 73690000.

The previous prime is 81059003. The next prime is 81059023. The reversal of 81059011 is 11095018.

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

It is a cyclic number.

It is not a de Polignac number, because 81059011 - 2³ = 81059003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81039011) 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, 3684490 + ... + 3684511.

It is an arithmetic number, because the mean of its divisors is an integer number (22107006).

Almost surely, 2^81059011 is an apocalyptic number.

81059011 is a deficient number, since it is larger than the sum of its proper divisors (7369013).

81059011 is a wasteful number, since it uses less digits than its factorization.

81059011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7369012.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 81059011 is about 9003.2777920044. The cubic root of 81059011 is about 432.7799179190.

The spelling of 81059011 in words is "eighty-one million, fifty-nine thousand, eleven".