551223540 has 108 divisors (see below), whose sum is σ = 1945062756. Its totient is φ = 125991936.

The previous prime is 551223529. The next prime is 551223551. The reversal of 551223540 is 45322155.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (551223529) and next prime (551223551).

It can be written as a sum of positive squares in 2 ways, for example, as 200335716 + 350887824 = 14154^2 + 18732^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22429 + ... + 40068.

Almost surely, 2^551223540 is an apocalyptic number.

It is an amenable number.

551223540 is an abundant number, since it is smaller than the sum of its proper divisors (1393839216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551223540 is a wasteful number, since it uses less digits than its factorization.

551223540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62526 (or 62514 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 551223540 is about 23478.1502678554. The cubic root of 551223540 is about 819.9283796261.

Adding to 551223540 its reverse (45322155), we get a palindrome (596545695).

The spelling of 551223540 in words is "five hundred fifty-one million, two hundred twenty-three thousand, five hundred forty".