81149196 has 24 divisors (see below), whose sum is σ = 195457024. Its totient is φ = 26177040.

The previous prime is 81149191. The next prime is 81149197. The reversal of 81149196 is 69194118.

It is a super-2 number, since 2×81149196² = 13170384022892832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81149191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108700 + ... + 109443.

Almost surely, 2^81149196 is an apocalyptic number.

It is an amenable number.

81149196 is an abundant number, since it is smaller than the sum of its proper divisors (114307828).

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

81149196 is a wasteful number, since it uses less digits than its factorization.

81149196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218181 (or 218179 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 81149196 is about 9008.2848534002. The cubic root of 81149196 is about 432.9403598429.

The spelling of 81149196 in words is "eighty-one million, one hundred forty-nine thousand, one hundred ninety-six".