81465043 has 4 divisors (see below), whose sum is σ = 88870968. Its totient is φ = 74059120.

The previous prime is 81465019. The next prime is 81465047. The reversal of 81465043 is 34056418.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81465043 - 2¹⁷ = 81333971 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81464996 and 81465014.

It is not an unprimeable number, because it can be changed into a prime (81465047) 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, 3702946 + ... + 3702967.

It is an arithmetic number, because the mean of its divisors is an integer number (22217742).

Almost surely, 2^81465043 is an apocalyptic number.

81465043 is a deficient number, since it is larger than the sum of its proper divisors (7405925).

81465043 is a wasteful number, since it uses less digits than its factorization.

81465043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7405924.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 81465043 is about 9025.7987458175. The cubic root of 81465043 is about 433.5013261206.

It can be divided in two parts, 81 and 465043, that added together give a square (465124 = 682²).

The spelling of 81465043 in words is "eighty-one million, four hundred sixty-five thousand, forty-three".