1921541 has 4 divisors (see below), whose sum is σ = 1966272. Its totient is φ = 1876812.

The previous prime is 1921537. The next prime is 1921553. The reversal of 1921541 is 1451291.

It is a happy number.

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 1921541 - 2² = 1921537 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 (1921531) 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, 22301 + ... + 22386.

It is an arithmetic number, because the mean of its divisors is an integer number (491568).

2^1921541 is an apocalyptic number.

It is an amenable number.

1921541 is a deficient number, since it is larger than the sum of its proper divisors (44731).

1921541 is an equidigital number, since it uses as much as digits as its factorization.

1921541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44730.

The product of its digits is 360, while the sum is 23.

The square root of 1921541 is about 1386.1965950038. The cubic root of 1921541 is about 124.3225430495.

The spelling of 1921541 in words is "one million, nine hundred twenty-one thousand, five hundred forty-one".