81230481 has 6 divisors (see below), whose sum is σ = 117332930. Its totient is φ = 54153648.

The previous prime is 81230477. The next prime is 81230489. The reversal of 81230481 is 18403218.

It can be written as a sum of positive squares in only one way, i.e., 60980481 + 20250000 = 7809^2 + 4500^2 .

It is not a de Polignac number, because 81230481 - 2² = 81230477 is a prime.

It is a super-2 number, since 2×81230481² = 13196782086982722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81230489) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4512796 + ... + 4512813.

Almost surely, 2^81230481 is an apocalyptic number.

It is an amenable number.

81230481 is a deficient number, since it is larger than the sum of its proper divisors (36102449).

81230481 is a wasteful number, since it uses less digits than its factorization.

81230481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9025615 (or 9025612 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81230481 is about 9012.7954043127. The cubic root of 81230481 is about 433.0848665674.

Adding to 81230481 its reverse (18403218), we get a palindrome (99633699).

The spelling of 81230481 in words is "eighty-one million, two hundred thirty thousand, four hundred eighty-one".