551215623 has 16 divisors (see below), whose sum is σ = 840504320. Its totient is φ = 314771616.

The previous prime is 551215607. The next prime is 551215649. The reversal of 551215623 is 326512155.

It is a happy number.

It is not a de Polignac number, because 551215623 - 2⁴ = 551215607 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 (551215663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27186 + ... + 42912.

It is an arithmetic number, because the mean of its divisors is an integer number (52531520).

Almost surely, 2^551215623 is an apocalyptic number.

551215623 is a deficient number, since it is larger than the sum of its proper divisors (289288697).

551215623 is a wasteful number, since it uses less digits than its factorization.

551215623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17406.

The product of its digits is 9000, while the sum is 30.

The square root of 551215623 is about 23477.9816636780. The cubic root of 551215623 is about 819.9244541745.

Adding to 551215623 its reverse (326512155), we get a palindrome (877727778).

The spelling of 551215623 in words is "five hundred fifty-one million, two hundred fifteen thousand, six hundred twenty-three".