551340161 has 4 divisors (see below), whose sum is σ = 564787524. Its totient is φ = 537892800.

The previous prime is 551340149. The next prime is 551340173. The reversal of 551340161 is 161043155.

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

It is an interprime number because it is at equal distance from previous prime (551340149) and next prime (551340173).

It can be written as a sum of positive squares in 2 ways, for example, as 86118400 + 465221761 = 9280^2 + 21569^2 .

It is a cyclic number.

It is not a de Polignac number, because 551340161 - 2²² = 547145857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551340161.

It is not an unprimeable number, because it can be changed into a prime (551340961) 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, 6723620 + ... + 6723701.

It is an arithmetic number, because the mean of its divisors is an integer number (141196881).

Almost surely, 2^551340161 is an apocalyptic number.

It is an amenable number.

551340161 is a deficient number, since it is larger than the sum of its proper divisors (13447363).

551340161 is a wasteful number, since it uses less digits than its factorization.

551340161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13447362.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 551340161 is about 23480.6337435769. The cubic root of 551340161 is about 819.9861989547.

The spelling of 551340161 in words is "five hundred fifty-one million, three hundred forty thousand, one hundred sixty-one".