551861147 has 4 divisors (see below), whose sum is σ = 551938896. Its totient is φ = 551783400.

The previous prime is 551861077. The next prime is 551861159. The reversal of 551861147 is 741168155.

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

It is a cyclic number.

It is not a de Polignac number, because 551861147 - 2⁸ = 551860891 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 551861147.

It is not an unprimeable number, because it can be changed into a prime (551861447) 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, 27023 + ... + 42824.

It is an arithmetic number, because the mean of its divisors is an integer number (137984724).

Almost surely, 2^551861147 is an apocalyptic number.

551861147 is a deficient number, since it is larger than the sum of its proper divisors (77749).

551861147 is an equidigital number, since it uses as much as digits as its factorization.

551861147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77748.

The product of its digits is 33600, while the sum is 38.

The square root of 551861147 is about 23491.7250750131. The cubic root of 551861147 is about 820.2443981997.

The spelling of 551861147 in words is "five hundred fifty-one million, eight hundred sixty-one thousand, one hundred forty-seven".