81005053 has 8 divisors (see below), whose sum is σ = 84389760. Its totient is φ = 77687520.

The previous prime is 81005039. The next prime is 81005059. The reversal of 81005053 is 35050018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81005053 - 2²¹ = 78907901 is a prime.

It is a super-2 number, since 2×81005053² = 13123637223065618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81005059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14325 + ... + 19162.

It is an arithmetic number, because the mean of its divisors is an integer number (10548720).

Almost surely, 2^81005053 is an apocalyptic number.

It is an amenable number.

81005053 is a deficient number, since it is larger than the sum of its proper divisors (3384707).

81005053 is a wasteful number, since it uses less digits than its factorization.

81005053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33587.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 81005053 is about 9000.2807178443. The cubic root of 81005053 is about 432.6838680497.

The spelling of 81005053 in words is "eighty-one million, five thousand, fifty-three".