551923 has 4 divisors (see below), whose sum is σ = 553480. Its totient is φ = 550368.

The previous prime is 551917. The next prime is 551927. The reversal of 551923 is 329155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329155 = 5 ⋅65831.

It is a cyclic number.

It is not a de Polignac number, because 551923 - 2¹⁷ = 420851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551927) 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, 43 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (138370).

2⁵⁵¹⁹²³ is an apocalyptic number.

551923 is a deficient number, since it is larger than the sum of its proper divisors (1557).

551923 is a wasteful number, since it uses less digits than its factorization.

551923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556.

The product of its digits is 1350, while the sum is 25.

The square root of 551923 is about 742.9152037750. The cubic root of 551923 is about 82.0275041585.

The spelling of 551923 in words is "five hundred fifty-one thousand, nine hundred twenty-three".