551551421 has 4 divisors (see below), whose sum is σ = 552426144. Its totient is φ = 550676700.

The previous prime is 551551397. The next prime is 551551459. The reversal of 551551421 is 124155155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 551551421 - 2²² = 547357117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551551471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436415 + ... + 437676.

It is an arithmetic number, because the mean of its divisors is an integer number (138106536).

Almost surely, 2^551551421 is an apocalyptic number.

It is an amenable number.

551551421 is a deficient number, since it is larger than the sum of its proper divisors (874723).

551551421 is an equidigital number, since it uses as much as digits as its factorization.

551551421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874722.

The product of its digits is 5000, while the sum is 29.

The square root of 551551421 is about 23485.1319136172. The cubic root of 551551421 is about 820.0909184337.

The spelling of 551551421 in words is "five hundred fifty-one million, five hundred fifty-one thousand, four hundred twenty-one".