551530531 has 2 divisors, whose sum is σ = 551530532. Its totient is φ = 551530530.

The previous prime is 551530487. The next prime is 551530607. The reversal of 551530531 is 135035155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551530531 - 2⁹ = 551530019 is a prime.

It is a super-2 number, since 2×551530531² = 608371853250283922, 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 551530531.

It is not a weakly prime, because it can be changed into another prime (551530831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275765265 + 275765266.

It is an arithmetic number, because the mean of its divisors is an integer number (275765266).

Almost surely, 2^551530531 is an apocalyptic number.

551530531 is a deficient number, since it is larger than the sum of its proper divisors (1).

551530531 is an equidigital number, since it uses as much as digits as its factorization.

551530531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5625, while the sum is 28.

The square root of 551530531 is about 23484.6871599347. The cubic root of 551530531 is about 820.0805646601.

Adding to 551530531 its reverse (135035155), we get a palindrome (686565686).

It can be divided in two parts, 5515 and 30531, that added together give a triangular number (36046 = T₂₆₈).

The spelling of 551530531 in words is "five hundred fifty-one million, five hundred thirty thousand, five hundred thirty-one".