4320551 has 4 divisors (see below), whose sum is σ = 4331832. Its totient is φ = 4309272.

The previous prime is 4320529. The next prime is 4320559. The reversal of 4320551 is 1550234.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4320551 - 2⁶ = 4320487 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 (4320559) 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, 5045 + ... + 5838.

It is an arithmetic number, because the mean of its divisors is an integer number (1082958).

Almost surely, 2^4320551 is an apocalyptic number.

4320551 is a deficient number, since it is larger than the sum of its proper divisors (11281).

4320551 is a wasteful number, since it uses less digits than its factorization.

4320551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11280.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 4320551 is about 2078.5935148557. The cubic root of 4320551 is about 162.8719809796.

Adding to 4320551 its reverse (1550234), we get a palindrome (5870785).

The spelling of 4320551 in words is "four million, three hundred twenty thousand, five hundred fifty-one".