81102586 has 8 divisors (see below), whose sum is σ = 122730804. Its totient is φ = 40192320.

The previous prime is 81102559. The next prime is 81102587. The reversal of 81102586 is 68520118.

It can be written as a sum of positive squares in 2 ways, for example, as 64496961 + 16605625 = 8031^2 + 4075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81102587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179205 + ... + 179656.

Almost surely, 2^81102586 is an apocalyptic number.

81102586 is a deficient number, since it is larger than the sum of its proper divisors (41628218).

81102586 is a wasteful number, since it uses less digits than its factorization.

81102586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358976.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 81102586 is about 9005.6974188566. The cubic root of 81102586 is about 432.8574540516.

The spelling of 81102586 in words is "eighty-one million, one hundred two thousand, five hundred eighty-six".