81454801 has 4 divisors (see below), whose sum is σ = 81925812. Its totient is φ = 80983792.

The previous prime is 81454777. The next prime is 81454811. The reversal of 81454801 is 10845418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10845418 = 2 ⋅5422709.

It can be written as a sum of positive squares in 2 ways, for example, as 57395776 + 24059025 = 7576^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 81454801 - 2⁷ = 81454673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81454811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235246 + ... + 235591.

It is an arithmetic number, because the mean of its divisors is an integer number (20481453).

Almost surely, 2^81454801 is an apocalyptic number.

It is an amenable number.

81454801 is a deficient number, since it is larger than the sum of its proper divisors (471011).

81454801 is a wasteful number, since it uses less digits than its factorization.

81454801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471010.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 81454801 is about 9025.2313543754. The cubic root of 81454801 is about 433.4831583827.

The spelling of 81454801 in words is "eighty-one million, four hundred fifty-four thousand, eight hundred one".