81361086 has 16 divisors (see below), whose sum is σ = 162810624. Its totient is φ = 27105624.

The previous prime is 81361079. The next prime is 81361123. The reversal of 81361086 is 68016318.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19371 + ... + 23193.

It is an arithmetic number, because the mean of its divisors is an integer number (10175664).

Almost surely, 2^81361086 is an apocalyptic number.

81361086 is an abundant number, since it is smaller than the sum of its proper divisors (81449538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81361086 is a wasteful number, since it uses less digits than its factorization.

81361086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7375.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81361086 is about 9020.0380265274. The cubic root of 81361086 is about 433.3168515756.

The spelling of 81361086 in words is "eighty-one million, three hundred sixty-one thousand, eighty-six".