81111852 has 72 divisors (see below), whose sum is σ = 209803776. Its totient is φ = 26417664.

The previous prime is 81111799. The next prime is 81111853. The reversal of 81111852 is 25811118.

It is not an unprimeable number, because it can be changed into a prime (81111853) 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, 516558 + ... + 516714.

Almost surely, 2^81111852 is an apocalyptic number.

It is an amenable number.

81111852 is an abundant number, since it is smaller than the sum of its proper divisors (128691924).

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

81111852 is a wasteful number, since it uses less digits than its factorization.

81111852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 402 counting only the distinct ones).

The product of its digits is 640, while the sum is 27.

The square root of 81111852 is about 9006.2118562690. The cubic root of 81111852 is about 432.8739381312.

The spelling of 81111852 in words is "eighty-one million, one hundred eleven thousand, eight hundred fifty-two".