81543058 has 4 divisors (see below), whose sum is σ = 122314590. Its totient is φ = 40771528.

The previous prime is 81543053. The next prime is 81543083. The reversal of 81543058 is 85034518.

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

It can be written as a sum of positive squares in only one way, i.e., 64593369 + 16949689 = 8037^2 + 4117^2 .

It is a super-3 number, since 3×81543058³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81543053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20385763 + ... + 20385766.

Almost surely, 2^81543058 is an apocalyptic number.

81543058 is a deficient number, since it is larger than the sum of its proper divisors (40771532).

81543058 is a wasteful number, since it uses less digits than its factorization.

81543058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40771531.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 81543058 is about 9030.1194897964. The cubic root of 81543058 is about 433.6396628217.

The spelling of 81543058 in words is "eighty-one million, five hundred forty-three thousand, fifty-eight".