81219096 has 48 divisors (see below), whose sum is σ = 251394000. Its totient is φ = 23205312.

The previous prime is 81219079. The next prime is 81219113. The reversal of 81219096 is 69091218.

It is an interprime number because it is at equal distance from previous prime (81219079) and next prime (81219113).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81219096.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 80071 + ... + 81078.

It is an arithmetic number, because the mean of its divisors is an integer number (5237375).

Almost surely, 2^81219096 is an apocalyptic number.

It is an amenable number.

81219096 is an abundant number, since it is smaller than the sum of its proper divisors (170174904).

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

81219096 is a wasteful number, since it uses less digits than its factorization.

81219096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161168 (or 161161 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 81219096 is about 9012.1637801363. The cubic root of 81219096 is about 433.0646323666.

The spelling of 81219096 in words is "eighty-one million, two hundred nineteen thousand, ninety-six".