81124443 has 16 divisors (see below), whose sum is σ = 120588160. Its totient is φ = 53901288.

The previous prime is 81124429. The next prime is 81124447. The reversal of 81124443 is 34442118.

It is not a de Polignac number, because 81124443 - 2¹³ = 81116251 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81124447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3396 + ... + 13182.

It is an arithmetic number, because the mean of its divisors is an integer number (7536760).

Almost surely, 2^81124443 is an apocalyptic number.

81124443 is a deficient number, since it is larger than the sum of its proper divisors (39463717).

81124443 is a wasteful number, since it uses less digits than its factorization.

81124443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10103 (or 10097 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 81124443 is about 9006.9108466777. The cubic root of 81124443 is about 432.8963353256.

The spelling of 81124443 in words is "eighty-one million, one hundred twenty-four thousand, four hundred forty-three".