10278509 has 2 divisors, whose sum is σ = 10278510. Its totient is φ = 10278508.

The previous prime is 10278503. The next prime is 10278517. The reversal of 10278509 is 90587201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8094025 + 2184484 = 2845^2 + 1478^2 .

It is an emirp because it is prime and its reverse (90587201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10278509 - 2⁸ = 10278253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10278503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5139254 + 5139255.

It is an arithmetic number, because the mean of its divisors is an integer number (5139255).

Almost surely, 2^10278509 is an apocalyptic number.

It is an amenable number.

10278509 is a deficient number, since it is larger than the sum of its proper divisors (1).

10278509 is an equidigital number, since it uses as much as digits as its factorization.

10278509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 10278509 is about 3206.0113848831. The cubic root of 10278509 is about 217.4252810680.

The spelling of 10278509 in words is "ten million, two hundred seventy-eight thousand, five hundred nine".