11781373 has 4 divisors (see below), whose sum is σ = 11804508. Its totient is φ = 11758240.

The previous prime is 11781361. The next prime is 11781377. The reversal of 11781373 is 37318711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4235364 + 7546009 = 2058^2 + 2747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11781373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10786 + ... + 11827.

It is an arithmetic number, because the mean of its divisors is an integer number (2951127).

Almost surely, 2^11781373 is an apocalyptic number.

It is an amenable number.

11781373 is a deficient number, since it is larger than the sum of its proper divisors (23135).

11781373 is an equidigital number, since it uses as much as digits as its factorization.

11781373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23134.

The product of its digits is 3528, while the sum is 31.

The square root of 11781373 is about 3432.4004719729. The cubic root of 11781373 is about 227.5439547965.

Multiplying 11781373 by its sum of digits (31), we get a palindrome (365222563).

The spelling of 11781373 in words is "eleven million, seven hundred eighty-one thousand, three hundred seventy-three".