81496219 has 8 divisors (see below), whose sum is σ = 93224160. Its totient is φ = 69789696.

The previous prime is 81496213. The next prime is 81496253. The reversal of 81496219 is 91269418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81496219 - 2⁷ = 81496091 is a prime.

It is a super-2 number, since 2×81496219² = 13283267422591922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81496213) 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, 3867 + ... + 13339.

It is an arithmetic number, because the mean of its divisors is an integer number (11653020).

Almost surely, 2^81496219 is an apocalyptic number.

81496219 is a deficient number, since it is larger than the sum of its proper divisors (11727941).

81496219 is a wasteful number, since it uses less digits than its factorization.

81496219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10709.

The product of its digits is 31104, while the sum is 40.

The square root of 81496219 is about 9027.5256299830. The cubic root of 81496219 is about 433.5566181952.

The spelling of 81496219 in words is "eighty-one million, four hundred ninety-six thousand, two hundred nineteen".