81002905311 has 16 divisors (see below), whose sum is σ = 114369948000. Its totient is φ = 50819616768.

The previous prime is 81002905309. The next prime is 81002905331. The reversal of 81002905311 is 11350920018.

It is not a de Polignac number, because 81002905311 - 2¹ = 81002905309 is a prime.

It is a super-2 number, since 2×81002905311² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81002905331) 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, 391855 + ... + 561743.

It is an arithmetic number, because the mean of its divisors is an integer number (7148121750).

Almost surely, 2^81002905311 is an apocalyptic number.

81002905311 is a deficient number, since it is larger than the sum of its proper divisors (33367042689).

81002905311 is a wasteful number, since it uses less digits than its factorization.

81002905311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179258.

The product of its (nonzero) digits is 2160, while the sum is 30.

The spelling of 81002905311 in words is "eighty-one billion, two million, nine hundred five thousand, three hundred eleven".