513320645 has 8 divisors (see below), whose sum is σ = 620119800. Its totient is φ = 407899840.

The previous prime is 513320641. The next prime is 513320651. The reversal of 513320645 is 546023315.

It can be written as a sum of positive squares in 4 ways, for example, as 110796676 + 402523969 = 10526^2 + 20063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 513320645 - 2² = 513320641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513320641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343766 + ... + 345255.

It is an arithmetic number, because the mean of its divisors is an integer number (77514975).

Almost surely, 2^513320645 is an apocalyptic number.

It is an amenable number.

513320645 is a deficient number, since it is larger than the sum of its proper divisors (106799155).

513320645 is a wasteful number, since it uses less digits than its factorization.

513320645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689175.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 513320645 is about 22656.5806113809. The cubic root of 513320645 is about 800.6872453857.

The spelling of 513320645 in words is "five hundred thirteen million, three hundred twenty thousand, six hundred forty-five".