81115050 has 48 divisors (see below), whose sum is σ = 201719232. Its totient is φ = 21571200.

The previous prime is 81115039. The next prime is 81115051. The reversal of 81115050 is 5051118.

It is not an unprimeable number, because it can be changed into a prime (81115051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94222 + ... + 95078.

It is an arithmetic number, because the mean of its divisors is an integer number (4202484).

Almost surely, 2^81115050 is an apocalyptic number.

81115050 is an abundant number, since it is smaller than the sum of its proper divisors (120604182).

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

81115050 is a wasteful number, since it uses less digits than its factorization.

81115050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 21.

The square root of 81115050 is about 9006.3893986436. The cubic root of 81115050 is about 432.8796270353.

Adding to 81115050 its reverse (5051118), we get a palindrome (86166168).

The spelling of 81115050 in words is "eighty-one million, one hundred fifteen thousand, fifty".