81543077 has 8 divisors (see below), whose sum is σ = 101664192. Its totient is φ = 63540000.

The previous prime is 81543053. The next prime is 81543083. The reversal of 81543077 is 77034518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81543077 - 2⁶ = 81543013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81543047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529424 + ... + 529577.

It is an arithmetic number, because the mean of its divisors is an integer number (12708024).

Almost surely, 2^81543077 is an apocalyptic number.

It is an amenable number.

81543077 is a deficient number, since it is larger than the sum of its proper divisors (20121115).

81543077 is a wasteful number, since it uses less digits than its factorization.

81543077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059019.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 81543077 is about 9030.1205418311. The cubic root of 81543077 is about 433.6396965019.

The spelling of 81543077 in words is "eighty-one million, five hundred forty-three thousand, seventy-seven".