81484971 has 16 divisors (see below), whose sum is σ = 109888800. Its totient is φ = 53706240.

The previous prime is 81484967. The next prime is 81484979. The reversal of 81484971 is 17948418.

It is not a de Polignac number, because 81484971 - 2² = 81484967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81484979) 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, 187971 + ... + 188403.

It is an arithmetic number, because the mean of its divisors is an integer number (6868050).

Almost surely, 2^81484971 is an apocalyptic number.

81484971 is a deficient number, since it is larger than the sum of its proper divisors (28403829).

81484971 is a wasteful number, since it uses less digits than its factorization.

81484971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006.

The product of its digits is 64512, while the sum is 42.

The square root of 81484971 is about 9026.9026249318. The cubic root of 81484971 is about 433.5366709745.

The spelling of 81484971 in words is "eighty-one million, four hundred eighty-four thousand, nine hundred seventy-one".