1921061 has 4 divisors (see below), whose sum is σ = 1923852. Its totient is φ = 1918272.

The previous prime is 1921037. The next prime is 1921063. The reversal of 1921061 is 1601291.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1601291 = 499 ⋅3209.

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 1144900 = 881^2 + 1070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921061 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 (1921063) 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, 461 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (480963).

2^1921061 is an apocalyptic number.

It is an amenable number.

1921061 is a deficient number, since it is larger than the sum of its proper divisors (2791).

1921061 is a wasteful number, since it uses less digits than its factorization.

1921061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1921061 is about 1386.0234485751. The cubic root of 1921061 is about 124.3121902840.

The spelling of 1921061 in words is "one million, nine hundred twenty-one thousand, sixty-one".