81475371 has 6 divisors (see below), whose sum is σ = 117686660. Its totient is φ = 54316908.

The previous prime is 81475357. The next prime is 81475379. The reversal of 81475371 is 17357418.

81475371 is a `hidden beast` number, since 81 + 47 + 537 + 1 = 666.

It is not a de Polignac number, because 81475371 - 2⁷ = 81475243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81475379) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4526401 + ... + 4526418.

Almost surely, 2^81475371 is an apocalyptic number.

81475371 is a deficient number, since it is larger than the sum of its proper divisors (36211289).

81475371 is a wasteful number, since it uses less digits than its factorization.

81475371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9052825 (or 9052822 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 81475371 is about 9026.3708654143. The cubic root of 81475371 is about 433.5196448675.

The spelling of 81475371 in words is "eighty-one million, four hundred seventy-five thousand, three hundred seventy-one".