81574453 has 4 divisors (see below), whose sum is σ = 81673920. Its totient is φ = 81474988.

The previous prime is 81574439. The next prime is 81574459. The reversal of 81574453 is 35447518.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35447518 = 2 ⋅17723759.

It is a cyclic number.

It is not a de Polignac number, because 81574453 - 2⁵ = 81574421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81574459) 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, 48493 + ... + 50146.

It is an arithmetic number, because the mean of its divisors is an integer number (20418480).

Almost surely, 2^81574453 is an apocalyptic number.

It is an amenable number.

81574453 is a deficient number, since it is larger than the sum of its proper divisors (99467).

81574453 is an equidigital number, since it uses as much as digits as its factorization.

81574453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99466.

The product of its digits is 67200, while the sum is 37.

The square root of 81574453 is about 9031.8576715978. The cubic root of 81574453 is about 433.6953077400.

The spelling of 81574453 in words is "eighty-one million, five hundred seventy-four thousand, four hundred fifty-three".