11931817 has 2 divisors, whose sum is σ = 11931818. Its totient is φ = 11931816.

The previous prime is 11931811. The next prime is 11931823. The reversal of 11931817 is 71813911.

It is a balanced prime because it is at equal distance from previous prime (11931811) and next prime (11931823).

It can be written as a sum of positive squares in only one way, i.e., 10686361 + 1245456 = 3269^2 + 1116^2 .

It is a cyclic number.

It is not a de Polignac number, because 11931817 - 2³ = 11931809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11931811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5965908 + 5965909.

It is an arithmetic number, because the mean of its divisors is an integer number (5965909).

Almost surely, 2^11931817 is an apocalyptic number.

It is an amenable number.

11931817 is a deficient number, since it is larger than the sum of its proper divisors (1).

11931817 is an equidigital number, since it uses as much as digits as its factorization.

11931817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 31.

The square root of 11931817 is about 3454.2462274713. The cubic root of 11931817 is about 228.5084132649.

The spelling of 11931817 in words is "eleven million, nine hundred thirty-one thousand, eight hundred seventeen".