2111949 has 18 divisors (see below), whose sum is σ = 3549390. Its totient is φ = 1206576.

The previous prime is 2111939. The next prime is 2111953. The reversal of 2111949 is 9491112.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 777924 = 1155^2 + 882^2 .

It is not a de Polignac number, because 2111949 - 2⁴ = 2111933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111909) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1954 + ... + 2835.

2^2111949 is an apocalyptic number.

It is an amenable number.

2111949 is a deficient number, since it is larger than the sum of its proper divisors (1437441).

2111949 is a wasteful number, since it uses less digits than its factorization.

2111949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4809 (or 4799 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 2111949 is about 1453.2546232509. The cubic root of 2111949 is about 128.3003404627.

The spelling of 2111949 in words is "two million, one hundred eleven thousand, nine hundred forty-nine".