81181062 has 16 divisors (see below), whose sum is σ = 180402480. Its totient is φ = 27060336.

The previous prime is 81181049. The next prime is 81181081. The reversal of 81181062 is 26018118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751623 + ... + 751730.

It is an arithmetic number, because the mean of its divisors is an integer number (11275155).

Almost surely, 2^81181062 is an apocalyptic number.

81181062 is an abundant number, since it is smaller than the sum of its proper divisors (99221418).

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

81181062 is a wasteful number, since it uses less digits than its factorization.

81181062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503364 (or 1503358 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 81181062 is about 9010.0533849695. The cubic root of 81181062 is about 432.9970220270.

It can be divided in two parts, 8118 and 1062, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 81181062 in words is "eighty-one million, one hundred eighty-one thousand, sixty-two".