81090094 has 16 divisors (see below), whose sum is σ = 123832800. Its totient is φ = 39817120.

The previous prime is 81090091. The next prime is 81090109. The reversal of 81090094 is 49009018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81090091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40632 + ... + 42580.

It is an arithmetic number, because the mean of its divisors is an integer number (7739550).

Almost surely, 2^81090094 is an apocalyptic number.

81090094 is a deficient number, since it is larger than the sum of its proper divisors (42742706).

81090094 is a wasteful number, since it uses less digits than its factorization.

81090094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 81090094 is about 9005.0038312041. The cubic root of 81090094 is about 432.8352289775.

The spelling of 81090094 in words is "eighty-one million, ninety thousand, ninety-four".