81468191 has 8 divisors (see below), whose sum is σ = 95623200. Its totient is φ = 67942368.

The previous prime is 81468161. The next prime is 81468227. The reversal of 81468191 is 19186418.

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 81468191 - 2¹⁰ = 81467167 is a prime.

It is a super-2 number, since 2×81468191² = 13274132289624962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81468151) 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, 157016 + ... + 157533.

It is an arithmetic number, because the mean of its divisors is an integer number (11952900).

Almost surely, 2^81468191 is an apocalyptic number.

81468191 is a deficient number, since it is larger than the sum of its proper divisors (14155009).

81468191 is a wasteful number, since it uses less digits than its factorization.

81468191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314593.

The product of its digits is 13824, while the sum is 38.

The square root of 81468191 is about 9025.9731331309. The cubic root of 81468191 is about 433.5069098841.

The spelling of 81468191 in words is "eighty-one million, four hundred sixty-eight thousand, one hundred ninety-one".