11731121 has 4 divisors (see below), whose sum is σ = 11742192. Its totient is φ = 11720052.

The previous prime is 11731103. The next prime is 11731129. The reversal of 11731121 is 12113711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12113711 = 139 ⋅87149.

It is a cyclic number.

It is not a de Polignac number, because 11731121 - 2¹⁰ = 11730097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11731121.

It is not an unprimeable number, because it can be changed into a prime (11731129) 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, 3755 + ... + 6128.

It is an arithmetic number, because the mean of its divisors is an integer number (2935548).

Almost surely, 2^11731121 is an apocalyptic number.

It is an amenable number.

11731121 is a deficient number, since it is larger than the sum of its proper divisors (11071).

11731121 is an equidigital number, since it uses as much as digits as its factorization.

11731121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11070.

The product of its digits is 42, while the sum is 17.

The square root of 11731121 is about 3425.0724079937. The cubic root of 11731121 is about 227.2199734577.

Adding to 11731121 its reverse (12113711), we get a palindrome (23844832).

The spelling of 11731121 in words is "eleven million, seven hundred thirty-one thousand, one hundred twenty-one".