81192612 has 48 divisors (see below), whose sum is σ = 201241152. Its totient is φ = 25390080.

The previous prime is 81192607. The next prime is 81192619. The reversal of 81192612 is 21629118.

It is a happy number.

It is a super-3 number, since 3×81192612³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81192612.

It is not an unprimeable number, because it can be changed into a prime (81192619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106312 + ... + 107072.

It is an arithmetic number, because the mean of its divisors is an integer number (4192524).

Almost surely, 2^81192612 is an apocalyptic number.

It is an amenable number.

81192612 is an abundant number, since it is smaller than the sum of its proper divisors (120048540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81192612 is a wasteful number, since it uses less digits than its factorization.

81192612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308 (or 1306 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 81192612 is about 9010.6943128707. The cubic root of 81192612 is about 433.0175558737.

It can be divided in two parts, 8119 and 2612, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 81192612 in words is "eighty-one million, one hundred ninety-two thousand, six hundred twelve".