81453236 has 6 divisors (see below), whose sum is σ = 142543170. Its totient is φ = 40726616.

The previous prime is 81453233. The next prime is 81453269. The reversal of 81453236 is 63235418.

81453236 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 79032100 + 2421136 = 8890^2 + 1556^2 .

81453236 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81453233) 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 as a sum of consecutive naturals, namely, 10181651 + ... + 10181658.

It is an arithmetic number, because the mean of its divisors is an integer number (23757195).

Almost surely, 2^81453236 is an apocalyptic number.

It is an amenable number.

81453236 is a deficient number, since it is larger than the sum of its proper divisors (61089934).

81453236 is a wasteful number, since it uses less digits than its factorization.

81453236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20363313 (or 20363311 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 81453236 is about 9025.1446525804. The cubic root of 81453236 is about 433.4803821784.

The spelling of 81453236 in words is "eighty-one million, four hundred fifty-three thousand, two hundred thirty-six".