81303869 has 8 divisors (see below), whose sum is σ = 85666080. Its totient is φ = 76950000.

The previous prime is 81303853. The next prime is 81303899. The reversal of 81303869 is 96830318.

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

It is not a de Polignac number, because 81303869 - 2⁴ = 81303853 is a prime.

It is a super-3 number, since 3×81303869³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81303899) 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, 34994 + ... + 37244.

It is an arithmetic number, because the mean of its divisors is an integer number (10708260).

Almost surely, 2^81303869 is an apocalyptic number.

It is an amenable number.

81303869 is a deficient number, since it is larger than the sum of its proper divisors (4362211).

81303869 is a wasteful number, since it uses less digits than its factorization.

81303869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 81303869 is about 9016.8658080289. The cubic root of 81303869 is about 433.2152513894.

The spelling of 81303869 in words is "eighty-one million, three hundred three thousand, eight hundred sixty-nine".