11291933781 has 24 divisors (see below), whose sum is σ = 16386757920. Its totient is φ = 7492849056.

The previous prime is 11291933771. The next prime is 11291933839. The reversal of 11291933781 is 18733919211.

It is a happy number.

It is not a de Polignac number, because 11291933781 - 2¹¹ = 11291931733 is a prime.

It is a super-2 number, since 2×11291933781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11291933771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4170030 + ... + 4172736.

It is an arithmetic number, because the mean of its divisors is an integer number (682781580).

Almost surely, 2^11291933781 is an apocalyptic number.

It is an amenable number.

11291933781 is a deficient number, since it is larger than the sum of its proper divisors (5094824139).

11291933781 is a wasteful number, since it uses less digits than its factorization.

11291933781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4705 (or 4702 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The spelling of 11291933781 in words is "eleven billion, two hundred ninety-one million, nine hundred thirty-three thousand, seven hundred eighty-one".