81024828831 has 18 divisors (see below), whose sum is σ = 118463013968. Its totient is φ = 53365709880.

The previous prime is 81024828827. The next prime is 81024828839. The reversal of 81024828831 is 13882842018.

It is a happy number.

It is not a de Polignac number, because 81024828831 - 2² = 81024828827 is a prime.

It is a super-2 number, since 2×81024828831² (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 (81024828839) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 591415 + ... + 715416.

Almost surely, 2^81024828831 is an apocalyptic number.

81024828831 is a deficient number, since it is larger than the sum of its proper divisors (37438185137).

81024828831 is a wasteful number, since it uses less digits than its factorization.

81024828831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307003 (or 1306917 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 45.

The spelling of 81024828831 in words is "eighty-one billion, twenty-four million, eight hundred twenty-eight thousand, eight hundred thirty-one".