81026333231 has 16 divisors (see below), whose sum is σ = 83064360960. Its totient is φ = 79014216960.

The previous prime is 81026333197. The next prime is 81026333281. The reversal of 81026333231 is 13233362018.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81026333231 is a prime.

It is a super-2 number, since 2×81026333231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81026333281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18723590 + ... + 18727916.

It is an arithmetic number, because the mean of its divisors is an integer number (5191522560).

Almost surely, 2^81026333231 is an apocalyptic number.

81026333231 is a deficient number, since it is larger than the sum of its proper divisors (2038027729).

81026333231 is a wasteful number, since it uses less digits than its factorization.

81026333231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7214.

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 81026333231 its reverse (13233362018), we get a palindrome (94259695249).

The spelling of 81026333231 in words is "eighty-one billion, twenty-six million, three hundred thirty-three thousand, two hundred thirty-one".