551400431 has 4 divisors (see below), whose sum is σ = 564849264. Its totient is φ = 537951600.

The previous prime is 551400427. The next prime is 551400449. The reversal of 551400431 is 134004155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551400431 - 2² = 551400427 is a prime.

It is a super-2 number, since 2×551400431² = 608084870613971522, 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 = 551400397 and 551400406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551400401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6724355 + ... + 6724436.

It is an arithmetic number, because the mean of its divisors is an integer number (141212316).

Almost surely, 2^551400431 is an apocalyptic number.

551400431 is a deficient number, since it is larger than the sum of its proper divisors (13448833).

551400431 is a wasteful number, since it uses less digits than its factorization.

551400431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13448832.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 551400431 is about 23481.9171065737. The cubic root of 551400431 is about 820.0160769206.

Adding to 551400431 its reverse (134004155), we get a palindrome (685404586).

The spelling of 551400431 in words is "five hundred fifty-one million, four hundred thousand, four hundred thirty-one".