81303523 has 8 divisors (see below), whose sum is σ = 93263360. Its totient is φ = 69429960.

The previous prime is 81303517. The next prime is 81303529. The reversal of 81303523 is 32530318.

It is an interprime number because it is at equal distance from previous prime (81303517) and next prime (81303529).

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 81303523 - 2²¹ = 79206371 is a prime.

It is a super-2 number, since 2×81303523² = 13220525704423058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81303529) 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, 19533 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (11657920).

Almost surely, 2^81303523 is an apocalyptic number.

81303523 is a deficient number, since it is larger than the sum of its proper divisors (11959837).

81303523 is a wasteful number, since it uses less digits than its factorization.

81303523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43137.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 81303523 is about 9016.8466217409. The cubic root of 81303523 is about 433.2146368525.

The spelling of 81303523 in words is "eighty-one million, three hundred three thousand, five hundred twenty-three".