11923861 has 2 divisors, whose sum is σ = 11923862. Its totient is φ = 11923860.

The previous prime is 11923831. The next prime is 11923889. The reversal of 11923861 is 16832911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 152100 = 3431^2 + 390^2 .

It is an emirp because it is prime and its reverse (16832911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11923861 - 2⁵ = 11923829 is a prime.

It is a super-2 number, since 2×11923861² = 284356922294642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11923831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5961930 + 5961931.

It is an arithmetic number, because the mean of its divisors is an integer number (5961931).

Almost surely, 2^11923861 is an apocalyptic number.

It is an amenable number.

11923861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11923861 is an equidigital number, since it uses as much as digits as its factorization.

11923861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 11923861 is about 3453.0944093668. The cubic root of 11923861 is about 228.4576130344.

The spelling of 11923861 in words is "eleven million, nine hundred twenty-three thousand, eight hundred sixty-one".