1020780269 has 2 divisors, whose sum is σ = 1020780270. Its totient is φ = 1020780268.

The previous prime is 1020780247. The next prime is 1020780331. The reversal of 1020780269 is 9620870201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1015187044 + 5593225 = 31862^2 + 2365^2 .

It is an emirp because it is prime and its reverse (9620870201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020780269 - 2²⁴ = 1004003053 is a prime.

It is a super-2 number, since 2×1020780269² = 2083984715159424722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020780869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510390134 + 510390135.

It is an arithmetic number, because the mean of its divisors is an integer number (510390135).

Almost surely, 2^1020780269 is an apocalyptic number.

It is an amenable number.

1020780269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020780269 is an equidigital number, since it uses as much as digits as its factorization.

1020780269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1020780269 is about 31949.6520951324. The cubic root of 1020780269 is about 1006.8793227306.

The spelling of 1020780269 in words is "one billion, twenty million, seven hundred eighty thousand, two hundred sixty-nine".