550115531 has 16 divisors (see below), whose sum is σ = 662592000. Its totient is φ = 446171328.

The previous prime is 550115521. The next prime is 550115551. The reversal of 550115531 is 135511055.

It is a cyclic number.

It is not a de Polignac number, because 550115531 - 2²² = 545921227 is a prime.

It is a super-2 number, since 2×550115531² = 605254194894823922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 550115531.

It is not an unprimeable number, because it can be changed into a prime (550115521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137546 + ... + 141488.

It is an arithmetic number, because the mean of its divisors is an integer number (41412000).

Almost surely, 2^550115531 is an apocalyptic number.

550115531 is a deficient number, since it is larger than the sum of its proper divisors (112476469).

550115531 is a wasteful number, since it uses less digits than its factorization.

550115531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018.

The product of its (nonzero) digits is 1875, while the sum is 26.

The square root of 550115531 is about 23454.5417989779. The cubic root of 550115531 is about 819.3786344665.

Adding to 550115531 its reverse (135511055), we get a palindrome (685626586).

The spelling of 550115531 in words is "five hundred fifty million, one hundred fifteen thousand, five hundred thirty-one".