81016019 has 8 divisors (see below), whose sum is σ = 97463040. Its totient is φ = 65787336.

The previous prime is 81015997. The next prime is 81016031. The reversal of 81016019 is 91061018.

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 81016019 - 2²⁴ = 64238803 is a prime.

It is a super-2 number, since 2×81016019² = 13127190669216722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81016069) 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, 304439 + ... + 304704.

It is an arithmetic number, because the mean of its divisors is an integer number (12182880).

Almost surely, 2^81016019 is an apocalyptic number.

81016019 is a deficient number, since it is larger than the sum of its proper divisors (16447021).

81016019 is a wasteful number, since it uses less digits than its factorization.

81016019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609169.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 81016019 is about 9000.8899004487. The cubic root of 81016019 is about 432.7033919231.

The spelling of 81016019 in words is "eighty-one million, sixteen thousand, nineteen".