81464091 has 16 divisors (see below), whose sum is σ = 113685504. Its totient is φ = 51790464.

The previous prime is 81464069. The next prime is 81464101. The reversal of 81464091 is 19046418.

It is not a de Polignac number, because 81464091 - 2⁹ = 81463579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81464041) 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, 23715 + ... + 26931.

It is an arithmetic number, because the mean of its divisors is an integer number (7105344).

Almost surely, 2^81464091 is an apocalyptic number.

81464091 is a deficient number, since it is larger than the sum of its proper divisors (32221413).

81464091 is a wasteful number, since it uses less digits than its factorization.

81464091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81464091 is about 9025.7460079486. The cubic root of 81464091 is about 433.4996374828.

The spelling of 81464091 in words is "eighty-one million, four hundred sixty-four thousand, ninety-one".