11931023 has 4 divisors (see below), whose sum is σ = 12848808. Its totient is φ = 11013240.

The previous prime is 11930999. The next prime is 11931061. The reversal of 11931023 is 32013911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32013911 = 131 ⋅244381.

It is a cyclic number.

It is not a de Polignac number, because 11931023 - 2¹⁶ = 11865487 is a prime.

It is a super-3 number, since 3×11931023³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11930986 and 11931004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11931223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458873 + ... + 458898.

It is an arithmetic number, because the mean of its divisors is an integer number (3212202).

Almost surely, 2^11931023 is an apocalyptic number.

11931023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11931023 is a deficient number, since it is larger than the sum of its proper divisors (917785).

11931023 is an equidigital number, since it uses as much as digits as its factorization.

11931023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917784.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 11931023 is about 3454.1312945515. The cubic root of 11931023 is about 228.5033444727.

Adding to 11931023 its reverse (32013911), we get a palindrome (43944934).

The spelling of 11931023 in words is "eleven million, nine hundred thirty-one thousand, twenty-three".