551811401 has 4 divisors (see below), whose sum is σ = 552011904. Its totient is φ = 551610900.

The previous prime is 551811383. The next prime is 551811437. The reversal of 551811401 is 104118155.

551811401 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551811401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551814401) 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, 96065 + ... + 101646.

It is an arithmetic number, because the mean of its divisors is an integer number (138002976).

Almost surely, 2^551811401 is an apocalyptic number.

It is an amenable number.

551811401 is a deficient number, since it is larger than the sum of its proper divisors (200503).

551811401 is a wasteful number, since it uses less digits than its factorization.

551811401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200502.

The product of its (nonzero) digits is 800, while the sum is 26.

The square root of 551811401 is about 23490.6662527907. Note that the first 3 decimals coincide. The cubic root of 551811401 is about 820.2197512366.

Adding to 551811401 its reverse (104118155), we get a palindrome (655929556).

The spelling of 551811401 in words is "five hundred fifty-one million, eight hundred eleven thousand, four hundred one".