81434116 has 6 divisors (see below), whose sum is σ = 142509710. Its totient is φ = 40717056.

The previous prime is 81434113. The next prime is 81434137. The reversal of 81434116 is 61143418.

It can be written as a sum of positive squares in only one way, i.e., 81180100 + 254016 = 9010^2 + 504^2 .

It is not an unprimeable number, because it can be changed into a prime (81434113) by changing a digit.

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, 10179261 + ... + 10179268.

Almost surely, 2^81434116 is an apocalyptic number.

It is an amenable number.

81434116 is a deficient number, since it is larger than the sum of its proper divisors (61075594).

81434116 is a wasteful number, since it uses less digits than its factorization.

81434116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20358533 (or 20358531 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 81434116 is about 9024.0853276108. The cubic root of 81434116 is about 433.4464617193.

The spelling of 81434116 in words is "eighty-one million, four hundred thirty-four thousand, one hundred sixteen".