81434963 has 4 divisors (see below), whose sum is σ = 81934728. Its totient is φ = 80935200.

The previous prime is 81434921. The next prime is 81435037. The reversal of 81434963 is 36943418.

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 81434963 - 2⁸ = 81434707 is a prime.

It is a super-2 number, since 2×81434963² = 13263306397622738, which contains 22 as substring.

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 (81434263) 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, 249638 + ... + 249963.

It is an arithmetic number, because the mean of its divisors is an integer number (20483682).

Almost surely, 2^81434963 is an apocalyptic number.

81434963 is a deficient number, since it is larger than the sum of its proper divisors (499765).

81434963 is a wasteful number, since it uses less digits than its factorization.

81434963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499764.

The product of its digits is 62208, while the sum is 38.

The square root of 81434963 is about 9024.1322574528. The cubic root of 81434963 is about 433.4479644796.

The spelling of 81434963 in words is "eighty-one million, four hundred thirty-four thousand, nine hundred sixty-three".