81416474 has 4 divisors (see below), whose sum is σ = 122124714. Its totient is φ = 40708236.

The previous prime is 81416473. The next prime is 81416479. The reversal of 81416474 is 47461418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47461418 = 2 ⋅23730709.

It can be written as a sum of positive squares in only one way, i.e., 68145025 + 13271449 = 8255^2 + 3643^2 .

It is not an unprimeable number, because it can be changed into a prime (81416473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20354117 + ... + 20354120.

Almost surely, 2^81416474 is an apocalyptic number.

81416474 is a deficient number, since it is larger than the sum of its proper divisors (40708240).

81416474 is a wasteful number, since it uses less digits than its factorization.

81416474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40708239.

The product of its digits is 21504, while the sum is 35.

The square root of 81416474 is about 9023.1077794738. The cubic root of 81416474 is about 433.4151586441.

The spelling of 81416474 in words is "eighty-one million, four hundred sixteen thousand, four hundred seventy-four".