551249761 has 4 divisors (see below), whose sum is σ = 551602224. Its totient is φ = 550897300.

The previous prime is 551249749. The next prime is 551249773. The reversal of 551249761 is 167942155.

551249761 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 an interprime number because it is at equal distance from previous prime (551249749) and next prime (551249773).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551249761 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551249711) 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, 173875 + ... + 177016.

It is an arithmetic number, because the mean of its divisors is an integer number (137900556).

Almost surely, 2^551249761 is an apocalyptic number.

It is an amenable number.

551249761 is a deficient number, since it is larger than the sum of its proper divisors (352463).

551249761 is a wasteful number, since it uses less digits than its factorization.

551249761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352462.

The product of its digits is 75600, while the sum is 40.

The square root of 551249761 is about 23478.7086740306. The cubic root of 551249761 is about 819.9413804020.

The spelling of 551249761 in words is "five hundred fifty-one million, two hundred forty-nine thousand, seven hundred sixty-one".