520653641531 has 4 divisors (see below), whose sum is σ = 520747848912. Its totient is φ = 520559434152.

The previous prime is 520653641513. The next prime is 520653641533. The reversal of 520653641531 is 135146356025.

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

It is a cyclic number.

It is not a de Polignac number, because 520653641531 - 2¹⁴ = 520653625147 is a prime.

It is a super-2 number, since 2×520653641531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520653641533) 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, 47095400 + ... + 47106453.

It is an arithmetic number, because the mean of its divisors is an integer number (130186962228).

Almost surely, 2^520653641531 is an apocalyptic number.

520653641531 is a deficient number, since it is larger than the sum of its proper divisors (94207381).

520653641531 is an equidigital number, since it uses as much as digits as its factorization.

520653641531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94207380.

The product of its (nonzero) digits is 324000, while the sum is 41.

Adding to 520653641531 its reverse (135146356025), we get a palindrome (655799997556).

The spelling of 520653641531 in words is "five hundred twenty billion, six hundred fifty-three million, six hundred forty-one thousand, five hundred thirty-one".