81411180 has 48 divisors (see below), whose sum is σ = 232261344. Its totient is φ = 21299200.

The previous prime is 81411167. The next prime is 81411193. The reversal of 81411180 is 8111418.

It is an interprime number because it is at equal distance from previous prime (81411167) and next prime (81411193).

It is a self number, because there is not a number n which added to its sum of digits gives 81411180.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9621 + ... + 15980.

It is an arithmetic number, because the mean of its divisors is an integer number (4838778).

Almost surely, 2^81411180 is an apocalyptic number.

It is an amenable number.

81411180 is an abundant number, since it is smaller than the sum of its proper divisors (150850164).

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

81411180 is a wasteful number, since it uses less digits than its factorization.

81411180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25666 (or 25664 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 24.

The square root of 81411180 is about 9022.8144167992. The cubic root of 81411180 is about 433.4057643554.

Adding to 81411180 its reverse (8111418), we get a palindrome (89522598).

The spelling of 81411180 in words is "eighty-one million, four hundred eleven thousand, one hundred eighty".