81019350 has 36 divisors (see below), whose sum is σ = 217673196. Its totient is φ = 21605040.

The previous prime is 81019349. The next prime is 81019369. The reversal of 81019350 is 5391018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 89572 + ... + 90471.

Almost surely, 2^81019350 is an apocalyptic number.

81019350 is an abundant number, since it is smaller than the sum of its proper divisors (136653846).

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

81019350 is a wasteful number, since it uses less digits than its factorization.

81019350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180061 (or 180053 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 81019350 is about 9001.0749358063. The cubic root of 81019350 is about 432.7093220888.

The spelling of 81019350 in words is "eighty-one million, nineteen thousand, three hundred fifty".