81134192 has 40 divisors (see below), whose sum is σ = 166691712. Its totient is φ = 38188800.

The previous prime is 81134189. The next prime is 81134197. The reversal of 81134192 is 29143118.

It is a super-2 number, since 2×81134192² = 13165514222985728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81134197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16142 + ... + 20562.

Almost surely, 2^81134192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81134192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83345856).

81134192 is an abundant number, since it is smaller than the sum of its proper divisors (85557520).

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

81134192 is a wasteful number, since it uses less digits than its factorization.

81134192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4497 (or 4491 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 81134192 is about 9007.4520259616. The cubic root of 81134192 is about 432.9136755056.

The spelling of 81134192 in words is "eighty-one million, one hundred thirty-four thousand, one hundred ninety-two".