65520913 has 2 divisors, whose sum is σ = 65520914. Its totient is φ = 65520912.

The previous prime is 65520899. The next prime is 65520937. The reversal of 65520913 is 31902556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55100929 + 10419984 = 7423^2 + 3228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65520913 is a prime.

It is not a weakly prime, because it can be changed into another prime (65520943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32760456 + 32760457.

It is an arithmetic number, because the mean of its divisors is an integer number (32760457).

Almost surely, 2^65520913 is an apocalyptic number.

It is an amenable number.

65520913 is a deficient number, since it is larger than the sum of its proper divisors (1).

65520913 is an equidigital number, since it uses as much as digits as its factorization.

65520913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 65520913 is about 8094.4989344616. The cubic root of 65520913 is about 403.1437953939.

The spelling of 65520913 in words is "sixty-five million, five hundred twenty thousand, nine hundred thirteen".