551404631 has 4 divisors (see below), whose sum is σ = 556284432. Its totient is φ = 546524832.

The previous prime is 551404597. The next prime is 551404661. The reversal of 551404631 is 136404155.

It is a happy number.

551404631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136404155 = 5 ⋅27280831.

It is a cyclic number.

It is not a de Polignac number, because 551404631 - 2¹⁴ = 551388247 is a prime.

It is a super-2 number, since 2×551404631² = 608094134176492322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551404594 and 551404603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551404661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2439731 + ... + 2439956.

It is an arithmetic number, because the mean of its divisors is an integer number (139071108).

Almost surely, 2^551404631 is an apocalyptic number.

551404631 is a deficient number, since it is larger than the sum of its proper divisors (4879801).

551404631 is a wasteful number, since it uses less digits than its factorization.

551404631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4879800.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 551404631 is about 23482.0065369210. The cubic root of 551404631 is about 820.0181589276.

Adding to 551404631 its reverse (136404155), we get a palindrome (687808786).

The spelling of 551404631 in words is "five hundred fifty-one million, four hundred four thousand, six hundred thirty-one".