81302135 has 8 divisors (see below), whose sum is σ = 100199616. Its totient is φ = 63283680.

The previous prime is 81302129. The next prime is 81302141. The reversal of 81302135 is 53120318.

It is an interprime number because it is at equal distance from previous prime (81302129) and next prime (81302141).

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

It is not a de Polignac number, because 81302135 - 2²⁰ = 80253559 is a prime.

It is a super-2 number, since 2×81302135² = 13220074311116450, which contains 22 as substring.

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 81302135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219551 + ... + 219920.

It is an arithmetic number, because the mean of its divisors is an integer number (12524952).

Almost surely, 2^81302135 is an apocalyptic number.

81302135 is a deficient number, since it is larger than the sum of its proper divisors (18897481).

81302135 is a wasteful number, since it uses less digits than its factorization.

81302135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439513.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 81302135 is about 9016.7696543718. The cubic root of 81302135 is about 433.2121715828.

The spelling of 81302135 in words is "eighty-one million, three hundred two thousand, one hundred thirty-five".