81219095 has 8 divisors (see below), whose sum is σ = 101700576. Its totient is φ = 62150176.

The previous prime is 81219079. The next prime is 81219113. The reversal of 81219095 is 59091218.

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 81219095 - 2⁴ = 81219079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353012 + ... + 353241.

It is an arithmetic number, because the mean of its divisors is an integer number (12712572).

Almost surely, 2^81219095 is an apocalyptic number.

81219095 is a deficient number, since it is larger than the sum of its proper divisors (20481481).

81219095 is a wasteful number, since it uses less digits than its factorization.

81219095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706281.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 81219095 is about 9012.1637246557. The cubic root of 81219095 is about 433.0646305893.

The spelling of 81219095 in words is "eighty-one million, two hundred nineteen thousand, ninety-five".