551646913 has 4 divisors (see below), whose sum is σ = 554694868. Its totient is φ = 548598960.

The previous prime is 551646877. The next prime is 551646959. The reversal of 551646913 is 319646155.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6517809 + 545129104 = 2553^2 + 23348^2 .

It is a cyclic number.

It is not a de Polignac number, because 551646913 - 2¹³ = 551638721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551646013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523706 + ... + 1524067.

It is an arithmetic number, because the mean of its divisors is an integer number (138673717).

Almost surely, 2^551646913 is an apocalyptic number.

It is an amenable number.

551646913 is a deficient number, since it is larger than the sum of its proper divisors (3047955).

551646913 is a wasteful number, since it uses less digits than its factorization.

551646913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047954.

The product of its digits is 97200, while the sum is 40.

The square root of 551646913 is about 23487.1648565765. The cubic root of 551646913 is about 820.1382440924.

The spelling of 551646913 in words is "five hundred fifty-one million, six hundred forty-six thousand, nine hundred thirteen".