255780013 has 2 divisors, whose sum is σ = 255780014. Its totient is φ = 255780012.

The previous prime is 255779999. The next prime is 255780023. The reversal of 255780013 is 310087552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131836324 + 123943689 = 11482^2 + 11133^2 .

It is a cyclic number.

It is not a de Polignac number, because 255780013 - 2¹³ = 255771821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255780023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127890006 + 127890007.

It is an arithmetic number, because the mean of its divisors is an integer number (127890007).

Almost surely, 2^255780013 is an apocalyptic number.

It is an amenable number.

255780013 is a deficient number, since it is larger than the sum of its proper divisors (1).

255780013 is an equidigital number, since it uses as much as digits as its factorization.

255780013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 255780013 is about 15993.1239287389. The cubic root of 255780013 is about 634.7784897089.

The spelling of 255780013 in words is "two hundred fifty-five million, seven hundred eighty thousand, thirteen".