81810098 has 16 divisors (see below), whose sum is σ = 124637184. Its totient is φ = 40269600.

The previous prime is 81810097. The next prime is 81810107. The reversal of 81810098 is 89001818.

It is not an unprimeable number, because it can be changed into a prime (81810097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33623 + ... + 35973.

It is an arithmetic number, because the mean of its divisors is an integer number (7789824).

Almost surely, 2^81810098 is an apocalyptic number.

81810098 is a deficient number, since it is larger than the sum of its proper divisors (42827086).

81810098 is a wasteful number, since it uses less digits than its factorization.

81810098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 81810098 is about 9044.8934764319. The cubic root of 81810098 is about 434.1125130362.

The spelling of 81810098 in words is "eighty-one million, eight hundred ten thousand, ninety-eight".