81485834 has 4 divisors (see below), whose sum is σ = 122228754. Its totient is φ = 40742916.

The previous prime is 81485821. The next prime is 81485897. The reversal of 81485834 is 43858418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43858418 = 2 ⋅21929209.

It can be written as a sum of positive squares in only one way, i.e., 72165025 + 9320809 = 8495^2 + 3053^2 .

It is a super-2 number, since 2×81485834² = 13279882285351112, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81485791 and 81485800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20371457 + ... + 20371460.

Almost surely, 2^81485834 is an apocalyptic number.

81485834 is a deficient number, since it is larger than the sum of its proper divisors (40742920).

81485834 is a wasteful number, since it uses less digits than its factorization.

81485834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40742919.

The product of its digits is 122880, while the sum is 41.

The square root of 81485834 is about 9026.9504263622. The cubic root of 81485834 is about 433.5382014850.

The spelling of 81485834 in words is "eighty-one million, four hundred eighty-five thousand, eight hundred thirty-four".