81352263 has 8 divisors (see below), whose sum is σ = 109324288. Its totient is φ = 53807544.

The previous prime is 81352261. The next prime is 81352289. The reversal of 81352263 is 36225318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81352263 - 2¹ = 81352261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81352263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81352261) 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, 106381 + ... + 107142.

It is an arithmetic number, because the mean of its divisors is an integer number (13665536).

Almost surely, 2^81352263 is an apocalyptic number.

81352263 is a deficient number, since it is larger than the sum of its proper divisors (27972025).

81352263 is a wasteful number, since it uses less digits than its factorization.

81352263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213653.

The product of its digits is 8640, while the sum is 30.

The square root of 81352263 is about 9019.5489355067. The cubic root of 81352263 is about 433.3011876877.

The spelling of 81352263 in words is "eighty-one million, three hundred fifty-two thousand, two hundred sixty-three".