81470219 has 8 divisors (see below), whose sum is σ = 82517760. Its totient is φ = 80427816.

The previous prime is 81470183. The next prime is 81470231. The reversal of 81470219 is 91207418.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81470219 is a prime.

It is a super-2 number, since 2×81470219² = 13274793167815922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81478219) 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, 37994 + ... + 40080.

It is an arithmetic number, because the mean of its divisors is an integer number (10314720).

Almost surely, 2^81470219 is an apocalyptic number.

81470219 is a deficient number, since it is larger than the sum of its proper divisors (1047541).

81470219 is a wasteful number, since it uses less digits than its factorization.

81470219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 81470219 is about 9026.0854748889. The cubic root of 81470219 is about 433.5105069719.

The spelling of 81470219 in words is "eighty-one million, four hundred seventy thousand, two hundred nineteen".