551404399 has 16 divisors (see below), whose sum is σ = 692507200. Its totient is φ = 436272480.

The previous prime is 551404391. The next prime is 551404417. The reversal of 551404399 is 993404155.

It is not a de Polignac number, because 551404399 - 2³ = 551404391 is a prime.

It is a super-2 number, since 2×551404399² = 608093622473102402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551404391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57372 + ... + 66289.

It is an arithmetic number, because the mean of its divisors is an integer number (43281700).

Almost surely, 2^551404399 is an apocalyptic number.

551404399 is a deficient number, since it is larger than the sum of its proper divisors (141102801).

551404399 is a wasteful number, since it uses less digits than its factorization.

551404399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123695 (or 123681 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 551404399 is about 23482.0015969678. The cubic root of 551404399 is about 820.0180439218.

The spelling of 551404399 in words is "five hundred fifty-one million, four hundred four thousand, three hundred ninety-nine".