5641921 has 8 divisors (see below), whose sum is σ = 5866920. Its totient is φ = 5419008.

The previous prime is 5641897. The next prime is 5641931. The reversal of 5641921 is 1291465.

It can be written as a sum of positive squares in 4 ways, for example, as 2873025 + 2768896 = 1695^2 + 1664^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5641921 - 2⁷ = 5641793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5641921.

It is not an unprimeable number, because it can be changed into a prime (5641931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7075 + ... + 7831.

It is an arithmetic number, because the mean of its divisors is an integer number (733365).

Almost surely, 2^5641921 is an apocalyptic number.

It is an amenable number.

5641921 is a deficient number, since it is larger than the sum of its proper divisors (224999).

5641921 is a wasteful number, since it uses less digits than its factorization.

5641921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its digits is 2160, while the sum is 28.

The square root of 5641921 is about 2375.2728264349. The cubic root of 5641921 is about 178.0228161638.

Subtracting from 5641921 its product of digits (2160), we obtain a triangular number (5639761 = T₃₃₅₈).

It can be divided in two parts, 564 and 1921, that added together give a triangular number (2485 = T₇₀).

The spelling of 5641921 in words is "five million, six hundred forty-one thousand, nine hundred twenty-one".