5515551 has 24 divisors (see below), whose sum is σ = 8401536. Its totient is φ = 3481920.

The previous prime is 5515541. The next prime is 5515579. The reversal of 5515551 is 1555155.

It is not a de Polignac number, because 5515551 - 2⁹ = 5515039 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5515501) 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 23 ways as a sum of consecutive naturals, for example, 14601 + ... + 14973.

It is an arithmetic number, because the mean of its divisors is an integer number (350064).

Almost surely, 2^5515551 is an apocalyptic number.

5515551 is a deficient number, since it is larger than the sum of its proper divisors (2885985).

5515551 is a wasteful number, since it uses less digits than its factorization.

5515551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 460 counting only the distinct ones).

The product of its digits is 3125, while the sum is 27.

The square root of 5515551 is about 2348.5210239638. The cubic root of 5515551 is about 176.6836252064.

The spelling of 5515551 in words is "five million, five hundred fifteen thousand, five hundred fifty-one".