551564161 has 4 divisors (see below), whose sum is σ = 552670000. Its totient is φ = 550458324.

The previous prime is 551564159. The next prime is 551564197. The reversal of 551564161 is 161465155.

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 not a de Polignac number, because 551564161 - 2¹ = 551564159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551564141) 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, 552171 + ... + 553168.

It is an arithmetic number, because the mean of its divisors is an integer number (138167500).

Almost surely, 2^551564161 is an apocalyptic number.

It is an amenable number.

551564161 is a deficient number, since it is larger than the sum of its proper divisors (1105839).

551564161 is a wasteful number, since it uses less digits than its factorization.

551564161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105838.

The product of its digits is 18000, while the sum is 34.

The square root of 551564161 is about 23485.4031474872. The cubic root of 551564161 is about 820.0972326699.

The spelling of 551564161 in words is "five hundred fifty-one million, five hundred sixty-four thousand, one hundred sixty-one".