81098895 has 8 divisors (see below), whose sum is σ = 129758256. Its totient is φ = 43252736.

The previous prime is 81098893. The next prime is 81098909. The reversal of 81098895 is 59889018.

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 81098895 - 2¹ = 81098893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81098893) 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, 2703282 + ... + 2703311.

It is an arithmetic number, because the mean of its divisors is an integer number (16219782).

Almost surely, 2^81098895 is an apocalyptic number.

81098895 is a deficient number, since it is larger than the sum of its proper divisors (48659361).

81098895 is a wasteful number, since it uses less digits than its factorization.

81098895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5406601.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 81098895 is about 9005.4924906970. The cubic root of 81098895 is about 432.8508874665.

It can be divided in two parts, 8 and 1098895, that added together give a triangular number (1098903 = T₁₄₈₂).

The spelling of 81098895 in words is "eighty-one million, ninety-eight thousand, eight hundred ninety-five".