11381234781 has 16 divisors (see below), whose sum is σ = 17345763968. Its totient is φ = 6502464000.

The previous prime is 11381234779. The next prime is 11381234789. The reversal of 11381234781 is 18743218311.

It is a happy number.

It is not a de Polignac number, because 11381234781 - 2¹ = 11381234779 is a prime.

It is a super-2 number, since 2×11381234781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11381234789) 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, 90981 + ... + 176181.

It is an arithmetic number, because the mean of its divisors is an integer number (1084110248).

Almost surely, 2^11381234781 is an apocalyptic number.

It is an amenable number.

11381234781 is a deficient number, since it is larger than the sum of its proper divisors (5964529187).

11381234781 is an equidigital number, since it uses as much as digits as its factorization.

11381234781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91572.

The product of its digits is 32256, while the sum is 39.

The spelling of 11381234781 in words is "eleven billion, three hundred eighty-one million, two hundred thirty-four thousand, seven hundred eighty-one".