551842 has 4 divisors (see below), whose sum is σ = 827766. Its totient is φ = 275920.

The previous prime is 551813. The next prime is 551843. The reversal of 551842 is 248155.

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

It can be written as a sum of positive squares in only one way, i.e., 436921 + 114921 = 661^2 + 339^2 .

It is not an unprimeable number, because it can be changed into a prime (551843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137959 + ... + 137962.

2⁵⁵¹⁸⁴² is an apocalyptic number.

551842 is a deficient number, since it is larger than the sum of its proper divisors (275924).

551842 is a wasteful number, since it uses less digits than its factorization.

551842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275923.

The product of its digits is 1600, while the sum is 25.

The square root of 551842 is about 742.8606868047. The cubic root of 551842 is about 82.0234911876.

Adding to 551842 its reverse (248155), we get a palindrome (799997).

The spelling of 551842 in words is "five hundred fifty-one thousand, eight hundred forty-two".