551331861 has 4 divisors (see below), whose sum is σ = 735109152. Its totient is φ = 367554572.

The previous prime is 551331839. The next prime is 551331881. The reversal of 551331861 is 168133155.

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 551331861 - 2⁵ = 551331829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551331821) 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, 91888641 + ... + 91888646.

It is an arithmetic number, because the mean of its divisors is an integer number (183777288).

Almost surely, 2^551331861 is an apocalyptic number.

It is an amenable number.

551331861 is a deficient number, since it is larger than the sum of its proper divisors (183777291).

551331861 is a wasteful number, since it uses less digits than its factorization.

551331861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183777290.

The product of its digits is 10800, while the sum is 33.

The square root of 551331861 is about 23480.4570015151. The cubic root of 551331861 is about 819.9820841812.

The spelling of 551331861 in words is "five hundred fifty-one million, three hundred thirty-one thousand, eight hundred sixty-one".