81454311 has 24 divisors (see below), whose sum is σ = 124225920. Its totient is φ = 51288336.

The previous prime is 81454271. The next prime is 81454319. The reversal of 81454311 is 11345418.

It is a happy number.

It is not a de Polignac number, because 81454311 - 2¹³ = 81446119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81454319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85540 + ... + 86486.

It is an arithmetic number, because the mean of its divisors is an integer number (5176080).

Almost surely, 2^81454311 is an apocalyptic number.

81454311 is a deficient number, since it is larger than the sum of its proper divisors (42771609).

81454311 is a wasteful number, since it uses less digits than its factorization.

81454311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1472 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 81454311 is about 9025.2042082160. The cubic root of 81454311 is about 433.4822891596.

Adding to 81454311 its reverse (11345418), we get a palindrome (92799729).

The spelling of 81454311 in words is "eighty-one million, four hundred fifty-four thousand, three hundred eleven".