81982453 has 4 divisors (see below), whose sum is σ = 93694240. Its totient is φ = 70270668.

The previous prime is 81982441. The next prime is 81982477. The reversal of 81982453 is 35428918.

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 a de Polignac number, because none of the positive numbers 2^k-81982453 is a prime.

It is a super-2 number, since 2×81982453² = 13442245199794418, 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 (81982403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5855883 + ... + 5855896.

It is an arithmetic number, because the mean of its divisors is an integer number (23423560).

Almost surely, 2^81982453 is an apocalyptic number.

It is an amenable number.

81982453 is a deficient number, since it is larger than the sum of its proper divisors (11711787).

81982453 is a wasteful number, since it uses less digits than its factorization.

81982453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11711786.

The product of its digits is 69120, while the sum is 40.

The square root of 81982453 is about 9054.4162153062. The cubic root of 81982453 is about 434.4171574976.

The spelling of 81982453 in words is "eighty-one million, nine hundred eighty-two thousand, four hundred fifty-three".