551401 has 4 divisors (see below), whose sum is σ = 554452. Its totient is φ = 548352.

The previous prime is 551387. The next prime is 551407. The reversal of 551401 is 104155.

It is a happy number.

551401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 301401 = 500^2 + 549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551401 is a prime.

It is a Duffinian number.

551401 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (551407) 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, 1236 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (138613).

2⁵⁵¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

551401 is a deficient number, since it is larger than the sum of its proper divisors (3051).

551401 is a wasteful number, since it uses less digits than its factorization.

551401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 551401 is about 742.5638019726. The cubic root of 551401 is about 82.0016358984.

Adding to 551401 its reverse (104155), we get a palindrome (655556).

The spelling of 551401 in words is "five hundred fifty-one thousand, four hundred one".