620521513 has 16 divisors (see below), whose sum is σ = 681264640. Its totient is φ = 562982400.

The previous prime is 620521507. The next prime is 620521547. The reversal of 620521513 is 315125026.

It is a cyclic number.

It is not a de Polignac number, because 620521513 - 2⁹ = 620521001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620581513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51703 + ... + 62563.

It is an arithmetic number, because the mean of its divisors is an integer number (42579040).

Almost surely, 2^620521513 is an apocalyptic number.

It is an amenable number.

620521513 is a deficient number, since it is larger than the sum of its proper divisors (60743127).

620521513 is a wasteful number, since it uses less digits than its factorization.

620521513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11008.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 620521513 is about 24910.2692277703. The cubic root of 620521513 is about 852.9409147251.

Adding to 620521513 its reverse (315125026), we get a palindrome (935646539).

The spelling of 620521513 in words is "six hundred twenty million, five hundred twenty-one thousand, five hundred thirteen".