11911013 has 2 divisors, whose sum is σ = 11911014. Its totient is φ = 11911012.

The previous prime is 11910973. The next prime is 11911019. The reversal of 11911013 is 31011911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7171684 + 4739329 = 2678^2 + 2177^2 .

It is a cyclic number.

It is not a de Polignac number, because 11911013 - 2¹⁸ = 11648869 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11910982 and 11911000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11911019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5955506 + 5955507.

It is an arithmetic number, because the mean of its divisors is an integer number (5955507).

Almost surely, 2^11911013 is an apocalyptic number.

It is an amenable number.

11911013 is a deficient number, since it is larger than the sum of its proper divisors (1).

11911013 is an equidigital number, since it uses as much as digits as its factorization.

11911013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27, while the sum is 17.

The square root of 11911013 is about 3451.2335475885. The cubic root of 11911013 is about 228.3755289320.

Adding to 11911013 its reverse (31011911), we get a palindrome (42922924).

The spelling of 11911013 in words is "eleven million, nine hundred eleven thousand, thirteen".