5105551 has 4 divisors (see below), whose sum is σ = 5569704. Its totient is φ = 4641400.

The previous prime is 5105531. The next prime is 5105561. The reversal of 5105551 is 1555015.

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 5105551 - 2¹⁷ = 4974479 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5105531) 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, 232060 + ... + 232081.

It is an arithmetic number, because the mean of its divisors is an integer number (1392426).

Almost surely, 2^5105551 is an apocalyptic number.

5105551 is the 1011-st centered decagonal number.

5105551 is a deficient number, since it is larger than the sum of its proper divisors (464153).

5105551 is a wasteful number, since it uses less digits than its factorization.

5105551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464152.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 5105551 is about 2259.5466359427. The cubic root of 5105551 is about 172.1924900152.

It can be divided in two parts, 510 and 5551, that multiplied together give a triangular number (2831010 = T₂₃₇₉).

The spelling of 5105551 in words is "five million, one hundred five thousand, five hundred fifty-one".