81003475 has 24 divisors (see below), whose sum is σ = 115166240. Its totient is φ = 55365120.

The previous prime is 81003463. The next prime is 81003509. The reversal of 81003475 is 57430018.

It is not a de Polignac number, because 81003475 - 2¹⁷ = 80872403 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75241 + ... + 76309.

Almost surely, 2^81003475 is an apocalyptic number.

81003475 is a deficient number, since it is larger than the sum of its proper divisors (34162765).

81003475 is a wasteful number, since it uses less digits than its factorization.

81003475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 81003475 is about 9000.1930534850. The cubic root of 81003475 is about 432.6810584325.

The spelling of 81003475 in words is "eighty-one million, three thousand, four hundred seventy-five".