1921113 has 12 divisors (see below), whose sum is σ = 2800980. Its totient is φ = 1268736.

The previous prime is 1921103. The next prime is 1921123. The reversal of 1921113 is 3111291.

It is an interprime number because it is at equal distance from previous prime (1921103) and next prime (1921123).

It can be written as a sum of positive squares in 2 ways, for example, as 363609 + 1557504 = 603^2 + 1248^2 .

It is not a de Polignac number, because 1921113 - 2⁴ = 1921097 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73 + ... + 1961.

It is an arithmetic number, because the mean of its divisors is an integer number (233415).

2^1921113 is an apocalyptic number.

It is an amenable number.

1921113 is a deficient number, since it is larger than the sum of its proper divisors (879867).

1921113 is a wasteful number, since it uses less digits than its factorization.

1921113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008 (or 2005 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

The square root of 1921113 is about 1386.0422071496. The cubic root of 1921113 is about 124.3133119169.

The spelling of 1921113 in words is "one million, nine hundred twenty-one thousand, one hundred thirteen".