102920813 has 2 divisors, whose sum is σ = 102920814. Its totient is φ = 102920812.

The previous prime is 102920803. The next prime is 102920821. The reversal of 102920813 is 318029201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95511529 + 7409284 = 9773^2 + 2722^2 .

It is a cyclic number.

It is not a de Polignac number, because 102920813 - 2⁶ = 102920749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102920803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51460406 + 51460407.

It is an arithmetic number, because the mean of its divisors is an integer number (51460407).

Almost surely, 2^102920813 is an apocalyptic number.

It is an amenable number.

102920813 is a deficient number, since it is larger than the sum of its proper divisors (1).

102920813 is an equidigital number, since it uses as much as digits as its factorization.

102920813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 102920813 is about 10144.9895514978. The cubic root of 102920813 is about 468.6346568233.

The spelling of 102920813 in words is "one hundred two million, nine hundred twenty thousand, eight hundred thirteen".