81121904269 has 8 divisors (see below), whose sum is σ = 93006950720. Its totient is φ = 69310908576.

The previous prime is 81121904221. The next prime is 81121904273. The reversal of 81121904269 is 96240912118.

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

It is not a de Polignac number, because 81121904269 - 2¹³ = 81121896077 is a prime.

It is a super-2 number, since 2×81121904269² (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 (81121904219) 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, 18510339 + ... + 18514720.

It is an arithmetic number, because the mean of its divisors is an integer number (11625868840).

Almost surely, 2^81121904269 is an apocalyptic number.

It is an amenable number.

81121904269 is a deficient number, since it is larger than the sum of its proper divisors (11885046451).

81121904269 is a wasteful number, since it uses less digits than its factorization.

81121904269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37025379.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 81121904269 in words is "eighty-one billion, one hundred twenty-one million, nine hundred four thousand, two hundred sixty-nine".