81412763 has 4 divisors (see below), whose sum is σ = 81762408. Its totient is φ = 81063120.

The previous prime is 81412759. The next prime is 81412783. The reversal of 81412763 is 36721418.

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 81412763 - 2² = 81412759 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81412703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174473 + ... + 174938.

It is an arithmetic number, because the mean of its divisors is an integer number (20440602).

Almost surely, 2^81412763 is an apocalyptic number.

81412763 is a deficient number, since it is larger than the sum of its proper divisors (349645).

81412763 is a wasteful number, since it uses less digits than its factorization.

81412763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349644.

The product of its digits is 8064, while the sum is 32.

The square root of 81412763 is about 9022.9021384475. The cubic root of 81412763 is about 433.4085734572.

The spelling of 81412763 in words is "eighty-one million, four hundred twelve thousand, seven hundred sixty-three".