81683053 has 4 divisors (see below), whose sum is σ = 84499740. Its totient is φ = 78866368.

The previous prime is 81683023. The next prime is 81683057. The reversal of 81683053 is 35038618.

It is a happy number.

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 17330569 + 64352484 = 4163^2 + 8022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81683053 is a prime.

It is a super-2 number, since 2×81683053² = 13344242294801618, 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 (81683057) 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, 1408300 + ... + 1408357.

It is an arithmetic number, because the mean of its divisors is an integer number (21124935).

Almost surely, 2^81683053 is an apocalyptic number.

It is an amenable number.

81683053 is a deficient number, since it is larger than the sum of its proper divisors (2816687).

81683053 is a wasteful number, since it uses less digits than its factorization.

81683053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816686.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 81683053 is about 9037.8677241925. The cubic root of 81683053 is about 433.8876817944.

The spelling of 81683053 in words is "eighty-one million, six hundred eighty-three thousand, fifty-three".