1028620913 has 2 divisors, whose sum is σ = 1028620914. Its totient is φ = 1028620912.

The previous prime is 1028620907. The next prime is 1028620939. The reversal of 1028620913 is 3190268201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648058849 + 380562064 = 25457^2 + 19508^2 .

It is an emirp because it is prime and its reverse (3190268201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1028620913 - 2¹⁸ = 1028358769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1028620913.

It is not a weakly prime, because it can be changed into another prime (1028620963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514310456 + 514310457.

It is an arithmetic number, because the mean of its divisors is an integer number (514310457).

Almost surely, 2^1028620913 is an apocalyptic number.

It is an amenable number.

1028620913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028620913 is an equidigital number, since it uses as much as digits as its factorization.

1028620913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1028620913 is about 32072.1204942860. The cubic root of 1028620913 is about 1009.4507071026.

The spelling of 1028620913 in words is "one billion, twenty-eight million, six hundred twenty thousand, nine hundred thirteen".