81075630331 has 8 divisors (see below), whose sum is σ = 81533390400. Its totient is φ = 80618337408.

The previous prime is 81075630301. The next prime is 81075630347. The reversal of 81075630331 is 13303657018.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81075630331 is a prime.

It is a super-2 number, since 2×81075630331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81075630301) 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, 234270 + ... + 465868.

It is an arithmetic number, because the mean of its divisors is an integer number (10191673800).

Almost surely, 2^81075630331 is an apocalyptic number.

81075630331 is a deficient number, since it is larger than the sum of its proper divisors (457760069).

81075630331 is a wasteful number, since it uses less digits than its factorization.

81075630331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233573.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 81075630331 in words is "eighty-one billion, seventy-five million, six hundred thirty thousand, three hundred thirty-one".