551403631 has 2 divisors, whose sum is σ = 551403632. Its totient is φ = 551403630.

The previous prime is 551403623. The next prime is 551403659. The reversal of 551403631 is 136304155.

551403631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (551403659) can be obtained adding 551403631 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551403631 - 2³ = 551403623 is a prime.

It is a super-2 number, since 2×551403631² = 608091928559968322, 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 551403631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551403661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275701815 + 275701816.

It is an arithmetic number, because the mean of its divisors is an integer number (275701816).

Almost surely, 2^551403631 is an apocalyptic number.

551403631 is a deficient number, since it is larger than the sum of its proper divisors (1).

551403631 is an equidigital number, since it uses as much as digits as its factorization.

551403631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 551403631 is about 23481.9852440121. The cubic root of 551403631 is about 820.0176632126.

Adding to 551403631 its reverse (136304155), we get a palindrome (687707786).

The spelling of 551403631 in words is "five hundred fifty-one million, four hundred three thousand, six hundred thirty-one".