81350819 has 8 divisors (see below), whose sum is σ = 88957440. Its totient is φ = 73779400.

The previous prime is 81350807. The next prime is 81350861. The reversal of 81350819 is 91805318.

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 81350819 - 2²⁴ = 64573603 is a prime.

It is a super-2 number, since 2×81350819² = 13235911503941522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81350879) 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, 3839 + ... + 13320.

It is an arithmetic number, because the mean of its divisors is an integer number (11119680).

Almost surely, 2^81350819 is an apocalyptic number.

81350819 is a deficient number, since it is larger than the sum of its proper divisors (7606621).

81350819 is a wasteful number, since it uses less digits than its factorization.

81350819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17601.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 81350819 is about 9019.4688868026. The cubic root of 81350819 is about 433.2986239786.

The spelling of 81350819 in words is "eighty-one million, three hundred fifty thousand, eight hundred nineteen".