5551921 has 2 divisors, whose sum is σ = 5551922. Its totient is φ = 5551920.

The previous prime is 5551919. The next prime is 5551927. The reversal of 5551921 is 1291555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2927521 + 2624400 = 1711^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 5551921 - 2¹ = 5551919 is a prime.

Together with 5551919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 5551921.

It is not a weakly prime, because it can be changed into another prime (5551927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2775960 + 2775961.

It is an arithmetic number, because the mean of its divisors is an integer number (2775961).

Almost surely, 2^5551921 is an apocalyptic number.

It is an amenable number.

5551921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5551921 is an equidigital number, since it uses as much as digits as its factorization.

5551921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250, while the sum is 28.

The square root of 5551921 is about 2356.2514721481. The cubic root of 5551921 is about 177.0711301887.

The spelling of 5551921 in words is "five million, five hundred fifty-one thousand, nine hundred twenty-one".