802780513 has 2 divisors, whose sum is σ = 802780514. Its totient is φ = 802780512.

The previous prime is 802780487. The next prime is 802780543. The reversal of 802780513 is 315087208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742671504 + 60109009 = 27252^2 + 7753^2 .

It is a cyclic number.

It is not a de Polignac number, because 802780513 - 2²¹ = 800683361 is a prime.

It is not a weakly prime, because it can be changed into another prime (802780543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401390256 + 401390257.

It is an arithmetic number, because the mean of its divisors is an integer number (401390257).

Almost surely, 2^802780513 is an apocalyptic number.

It is an amenable number.

802780513 is a deficient number, since it is larger than the sum of its proper divisors (1).

802780513 is an equidigital number, since it uses as much as digits as its factorization.

802780513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 802780513 is about 28333.3816019197. The cubic root of 802780513 is about 929.3920229468.

The spelling of 802780513 in words is "eight hundred two million, seven hundred eighty thousand, five hundred thirteen".