81411075 has 48 divisors (see below), whose sum is σ = 151503200. Its totient is φ = 43390080.

The previous prime is 81411047. The next prime is 81411089. The reversal of 81411075 is 57011418.

It is not a de Polignac number, because 81411075 - 2⁷ = 81410947 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53931 + ... + 55419.

Almost surely, 2^81411075 is an apocalyptic number.

81411075 is a deficient number, since it is larger than the sum of its proper divisors (70092125).

81411075 is an equidigital number, since it uses as much as digits as its factorization.

81411075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 81411075 is about 9022.8085982138. The cubic root of 81411075 is about 433.4055780271.

It can be divided in two parts, 8141 and 1075, that added together give a square (9216 = 96²).

The spelling of 81411075 in words is "eighty-one million, four hundred eleven thousand, seventy-five".