4351921 has 4 divisors (see below), whose sum is σ = 4973632. Its totient is φ = 3730212.

The previous prime is 4351891. The next prime is 4351933. The reversal of 4351921 is 1291534.

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 4351921 - 2⁷ = 4351793 is a prime.

It is a Duffinian number.

4351921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4351981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310845 + ... + 310858.

It is an arithmetic number, because the mean of its divisors is an integer number (1243408).

Almost surely, 2^4351921 is an apocalyptic number.

It is an amenable number.

4351921 is a deficient number, since it is larger than the sum of its proper divisors (621711).

4351921 is an equidigital number, since it uses as much as digits as its factorization.

4351921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621710.

The product of its digits is 1080, while the sum is 25.

The square root of 4351921 is about 2086.1258351308. The cubic root of 4351921 is about 163.2652161701.

The spelling of 4351921 in words is "four million, three hundred fifty-one thousand, nine hundred twenty-one".