303640013 has 2 divisors, whose sum is σ = 303640014. Its totient is φ = 303640012.

The previous prime is 303639991. The next prime is 303640049. The reversal of 303640013 is 310046303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253541929 + 50098084 = 15923^2 + 7078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-303640013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (303642013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151820006 + 151820007.

It is an arithmetic number, because the mean of its divisors is an integer number (151820007).

Almost surely, 2^303640013 is an apocalyptic number.

It is an amenable number.

303640013 is a deficient number, since it is larger than the sum of its proper divisors (1).

303640013 is an equidigital number, since it uses as much as digits as its factorization.

303640013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 303640013 is about 17425.2693809881. The cubic root of 303640013 is about 672.1295670012.

Adding to 303640013 its reverse (310046303), we get a palindrome (613686316).

The spelling of 303640013 in words is "three hundred three million, six hundred forty thousand, thirteen".