81238927194 has 12 divisors (see below), whose sum is σ = 176017675626. Its totient is φ = 27079642392.

The previous prime is 81238927183. The next prime is 81238927199. The reversal of 81238927194 is 49172983218.

It can be written as a sum of positive squares in only one way, i.e., 60116664969 + 21122262225 = 245187^2 + 145335^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81238927194.

It is not an unprimeable number, because it can be changed into a prime (81238927199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2256636849 + ... + 2256636884.

Almost surely, 2^81238927194 is an apocalyptic number.

81238927194 is an abundant number, since it is smaller than the sum of its proper divisors (94778748432).

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

81238927194 is a wasteful number, since it uses less digits than its factorization.

81238927194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513273741 (or 4513273738 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 81238927194 in words is "eighty-one billion, two hundred thirty-eight million, nine hundred twenty-seven thousand, one hundred ninety-four".