5451921 has 8 divisors (see below), whose sum is σ = 8076960. Its totient is φ = 3634596.

The previous prime is 5451889. The next prime is 5451931. The reversal of 5451921 is 1291545.

It is not a de Polignac number, because 5451921 - 2⁵ = 5451889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 201923 = 5451921 / (5 + 4 + 5 + 1 + 9 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5451931) 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, 100935 + ... + 100988.

It is an arithmetic number, because the mean of its divisors is an integer number (1009620).

Almost surely, 2^5451921 is an apocalyptic number.

It is an amenable number.

5451921 is a deficient number, since it is larger than the sum of its proper divisors (2625039).

5451921 is a wasteful number, since it uses less digits than its factorization.

5451921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201932 (or 201926 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 5451921 is about 2334.9349027328. The cubic root of 5451921 is about 176.0015603340.

The spelling of 5451921 in words is "five million, four hundred fifty-one thousand, nine hundred twenty-one".