2111917 has 2 divisors, whose sum is σ = 2111918. Its totient is φ = 2111916.

The previous prime is 2111909. The next prime is 2111933. The reversal of 2111917 is 7191112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153476 + 958441 = 1074^2 + 979^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111917 - 2³ = 2111909 is a prime.

2111917 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055958 + 1055959.

It is an arithmetic number, because the mean of its divisors is an integer number (1055959).

2^2111917 is an apocalyptic number.

It is an amenable number.

2111917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111917 is an equidigital number, since it uses as much as digits as its factorization.

2111917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 22.

The square root of 2111917 is about 1453.2436134386. The cubic root of 2111917 is about 128.2996924622.

The spelling of 2111917 in words is "two million, one hundred eleven thousand, nine hundred seventeen".