81306098 has 4 divisors (see below), whose sum is σ = 121959150. Its totient is φ = 40653048.

The previous prime is 81306097. The next prime is 81306119. The reversal of 81306098 is 89060318.

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., 51308569 + 29997529 = 7163^2 + 5477^2 .

It is a super-2 number, since 2×81306098² = 13221363143971208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81306091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20326523 + ... + 20326526.

Almost surely, 2^81306098 is an apocalyptic number.

81306098 is a deficient number, since it is larger than the sum of its proper divisors (40653052).

81306098 is a wasteful number, since it uses less digits than its factorization.

81306098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40653051.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 81306098 is about 9016.9894088881. The cubic root of 81306098 is about 433.2192103153.

The spelling of 81306098 in words is "eighty-one million, three hundred six thousand, ninety-eight".