255979709 has 2 divisors, whose sum is σ = 255979710. Its totient is φ = 255979708.

The previous prime is 255979699. The next prime is 255979721. The reversal of 255979709 is 907979552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210888484 + 45091225 = 14522^2 + 6715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255979709 is a prime.

It is a super-2 number, since 2×255979709² = 131051222839449362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255979309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127989854 + 127989855.

It is an arithmetic number, because the mean of its divisors is an integer number (127989855).

Almost surely, 2^255979709 is an apocalyptic number.

It is an amenable number.

255979709 is a deficient number, since it is larger than the sum of its proper divisors (1).

255979709 is an equidigital number, since it uses as much as digits as its factorization.

255979709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1786050, while the sum is 53.

The square root of 255979709 is about 15999.3658936847. The cubic root of 255979709 is about 634.9436443259.

The spelling of 255979709 in words is "two hundred fifty-five million, nine hundred seventy-nine thousand, seven hundred nine".