81416546 has 4 divisors (see below), whose sum is σ = 122124822. Its totient is φ = 40708272.

The previous prime is 81416537. The next prime is 81416551. The reversal of 81416546 is 64561418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60668521 + 20748025 = 7789^2 + 4555^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20354135 + ... + 20354138.

Almost surely, 2^81416546 is an apocalyptic number.

81416546 is a deficient number, since it is larger than the sum of its proper divisors (40708276).

81416546 is a wasteful number, since it uses less digits than its factorization.

81416546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40708275.

The product of its digits is 23040, while the sum is 35.

The square root of 81416546 is about 9023.1117692291. Note that the first 3 decimals coincide. The cubic root of 81416546 is about 433.4152864065.

The spelling of 81416546 in words is "eighty-one million, four hundred sixteen thousand, five hundred forty-six".