81007832331 has 6 divisors (see below), whose sum is σ = 117011313380. Its totient is φ = 54005221548.

The previous prime is 81007832291. The next prime is 81007832333. The reversal of 81007832331 is 13323870018.

It is not a de Polignac number, because 81007832331 - 2¹⁵ = 81007799563 is a prime.

It is a super-2 number, since 2×81007832331² (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 (81007832333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4500435121 + ... + 4500435138.

Almost surely, 2^81007832331 is an apocalyptic number.

81007832331 is a deficient number, since it is larger than the sum of its proper divisors (36003481049).

81007832331 is a wasteful number, since it uses less digits than its factorization.

81007832331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000870265 (or 9000870262 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 81007832331 in words is "eighty-one billion, seven million, eight hundred thirty-two thousand, three hundred thirty-one".