520344551 has 4 divisors (see below), whose sum is σ = 550953072. Its totient is φ = 489736032.

The previous prime is 520344533. The next prime is 520344553. The reversal of 520344551 is 155443025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520344551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520344553) 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, 15304235 + ... + 15304268.

It is an arithmetic number, because the mean of its divisors is an integer number (137738268).

Almost surely, 2^520344551 is an apocalyptic number.

520344551 is a deficient number, since it is larger than the sum of its proper divisors (30608521).

520344551 is a wasteful number, since it uses less digits than its factorization.

520344551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30608520.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 520344551 is about 22811.0620313917. The cubic root of 520344551 is about 804.3227208483.

Adding to 520344551 its reverse (155443025), we get a palindrome (675787576).

The spelling of 520344551 in words is "five hundred twenty million, three hundred forty-four thousand, five hundred fifty-one".