4551391 has 4 divisors (see below), whose sum is σ = 4901512. Its totient is φ = 4201272.

The previous prime is 4551361. The next prime is 4551397. The reversal of 4551391 is 1931554.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1931554 = 2 ⋅965777.

It is a cyclic number.

It is not a de Polignac number, because 4551391 - 2⁹ = 4550879 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 (4551397) 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, 175041 + ... + 175066.

It is an arithmetic number, because the mean of its divisors is an integer number (1225378).

Almost surely, 2^4551391 is an apocalyptic number.

4551391 is a deficient number, since it is larger than the sum of its proper divisors (350121).

4551391 is a wasteful number, since it uses less digits than its factorization.

4551391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350120.

The product of its digits is 2700, while the sum is 28.

The square root of 4551391 is about 2133.3989312831. The cubic root of 4551391 is about 165.7224641015.

It can be divided in two parts, 4551 and 391, that multiplied together give a triangular number (1779441 = T₁₈₈₆).

The spelling of 4551391 in words is "four million, five hundred fifty-one thousand, three hundred ninety-one".