2111957 has 4 divisors (see below), whose sum is σ = 2115936. Its totient is φ = 2107980.

The previous prime is 2111953. The next prime is 2111959. The reversal of 2111957 is 7591112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111957 - 2² = 2111953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043 + ... + 2304.

It is an arithmetic number, because the mean of its divisors is an integer number (528984).

2^2111957 is an apocalyptic number.

It is an amenable number.

2111957 is a deficient number, since it is larger than the sum of its proper divisors (3979).

2111957 is an equidigital number, since it uses as much as digits as its factorization.

2111957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978.

The product of its digits is 630, while the sum is 26.

The square root of 2111957 is about 1453.2573756909. The cubic root of 2111957 is about 128.3005024618.

The spelling of 2111957 in words is "two million, one hundred eleven thousand, nine hundred fifty-seven".