2101949 has 4 divisors (see below), whose sum is σ = 2174460. Its totient is φ = 2029440.

The previous prime is 2101909. The next prime is 2101961. The reversal of 2101949 is 9491012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 931225 + 1170724 = 965^2 + 1082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101949 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 (2101909) 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, 36212 + ... + 36269.

It is an arithmetic number, because the mean of its divisors is an integer number (543615).

2^2101949 is an apocalyptic number.

2101949 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2101949 is a deficient number, since it is larger than the sum of its proper divisors (72511).

2101949 is an equidigital number, since it uses as much as digits as its factorization.

2101949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72510.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 2101949 is about 1449.8099875501. The cubic root of 2101949 is about 128.0975208966.

The spelling of 2101949 in words is "two million, one hundred one thousand, nine hundred forty-nine".