551312531 has 16 divisors (see below), whose sum is σ = 723528960. Its totient is φ = 406982880.

The previous prime is 551312521. The next prime is 551312539. The reversal of 551312531 is 135213155.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 551312531 - 2¹⁴ = 551296147 is a prime.

It is a super-2 number, since 2×551312531² = 607891013675251922, 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 551312531.

It is not an unprimeable number, because it can be changed into a prime (551312539) 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, 186956 + ... + 189881.

It is an arithmetic number, because the mean of its divisors is an integer number (45220560).

Almost surely, 2^551312531 is an apocalyptic number.

551312531 is a deficient number, since it is larger than the sum of its proper divisors (172216429).

551312531 is a wasteful number, since it uses less digits than its factorization.

551312531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376874.

The product of its digits is 2250, while the sum is 26.

The square root of 551312531 is about 23480.0453790021. The cubic root of 551312531 is about 819.9725010608.

Adding to 551312531 its reverse (135213155), we get a palindrome (686525686).

The spelling of 551312531 in words is "five hundred fifty-one million, three hundred twelve thousand, five hundred thirty-one".