81146612 has 6 divisors (see below), whose sum is σ = 142006578. Its totient is φ = 40573304.

The previous prime is 81146609. The next prime is 81146617. The reversal of 81146612 is 21664118.

It can be written as a sum of positive squares in only one way, i.e., 72829156 + 8317456 = 8534^2 + 2884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81146617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10143323 + ... + 10143330.

It is an arithmetic number, because the mean of its divisors is an integer number (23667763).

Almost surely, 2^81146612 is an apocalyptic number.

It is an amenable number.

81146612 is a deficient number, since it is larger than the sum of its proper divisors (60859966).

81146612 is a wasteful number, since it uses less digits than its factorization.

81146612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20286657 (or 20286655 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 81146612 is about 9008.1414287299. The cubic root of 81146612 is about 432.9357644810.

The spelling of 81146612 in words is "eighty-one million, one hundred forty-six thousand, six hundred twelve".