81084098 has 4 divisors (see below), whose sum is σ = 121626150. Its totient is φ = 40542048.

The previous prime is 81084097. The next prime is 81084149. The reversal of 81084098 is 89048018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47293129 + 33790969 = 6877^2 + 5813^2 .

It is a Curzon number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (81084097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20271023 + ... + 20271026.

Almost surely, 2^81084098 is an apocalyptic number.

81084098 is a deficient number, since it is larger than the sum of its proper divisors (40542052).

81084098 is a wasteful number, since it uses less digits than its factorization.

81084098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40542051.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 81084098 is about 9004.6708990390. The cubic root of 81084098 is about 432.8245604158.

The spelling of 81084098 in words is "eighty-one million, eighty-four thousand, ninety-eight".