81050053 has 4 divisors (see below), whose sum is σ = 92628640. Its totient is φ = 69471468.

The previous prime is 81050051. The next prime is 81050059. The reversal of 81050053 is 35005018.

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 81050053 - 2¹ = 81050051 is a prime.

It is a super-2 number, since 2×81050053² = 13138222182605618, 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 (81050051) 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, 5789283 + ... + 5789296.

It is an arithmetic number, because the mean of its divisors is an integer number (23157160).

Almost surely, 2^81050053 is an apocalyptic number.

It is an amenable number.

81050053 is a deficient number, since it is larger than the sum of its proper divisors (11578587).

81050053 is a wasteful number, since it uses less digits than its factorization.

81050053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11578586.

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

The square root of 81050053 is about 9002.7802927762. The cubic root of 81050053 is about 432.7639748619.

The spelling of 81050053 in words is "eighty-one million, fifty thousand, fifty-three".