81452485 has 4 divisors (see below), whose sum is σ = 97742988. Its totient is φ = 65161984.

The previous prime is 81452479. The next prime is 81452519. The reversal of 81452485 is 58425418.

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 37136836 + 44315649 = 6094^2 + 6657^2 .

It is a cyclic number.

It is not a de Polignac number, because 81452485 - 2³ = 81452477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8145244 + ... + 8145253.

It is an arithmetic number, because the mean of its divisors is an integer number (24435747).

Almost surely, 2^81452485 is an apocalyptic number.

It is an amenable number.

81452485 is a deficient number, since it is larger than the sum of its proper divisors (16290503).

81452485 is a wasteful number, since it uses less digits than its factorization.

81452485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16290502.

The product of its digits is 51200, while the sum is 37.

The square root of 81452485 is about 9025.1030465031. The cubic root of 81452485 is about 433.4790499426.

The spelling of 81452485 in words is "eighty-one million, four hundred fifty-two thousand, four hundred eighty-five".