5551621 has 8 divisors (see below), whose sum is σ = 5662944. Its totient is φ = 5441520.

The previous prime is 5551607. The next prime is 5551627. The reversal of 5551621 is 1261555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5551621 - 2⁵ = 5551589 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 (5551627) 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, 17355 + ... + 17671.

It is an arithmetic number, because the mean of its divisors is an integer number (707868).

Almost surely, 2^5551621 is an apocalyptic number.

It is an amenable number.

5551621 is a deficient number, since it is larger than the sum of its proper divisors (111323).

5551621 is a wasteful number, since it uses less digits than its factorization.

5551621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its digits is 1500, while the sum is 25.

The square root of 5551621 is about 2356.1878108504. The cubic root of 5551621 is about 177.0679407643.

The spelling of 5551621 in words is "five million, five hundred fifty-one thousand, six hundred twenty-one".