255549997 has 2 divisors, whose sum is σ = 255549998. Its totient is φ = 255549996.

The previous prime is 255549991. The next prime is 255550013. The reversal of 255549997 is 799945552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254370601 + 1179396 = 15949^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 255549997 - 2⁷ = 255549869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255549991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127774998 + 127774999.

It is an arithmetic number, because the mean of its divisors is an integer number (127774999).

Almost surely, 2^255549997 is an apocalyptic number.

It is an amenable number.

255549997 is a deficient number, since it is larger than the sum of its proper divisors (1).

255549997 is an equidigital number, since it uses as much as digits as its factorization.

255549997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5103000, while the sum is 55.

The square root of 255549997 is about 15985.9312209205. The cubic root of 255549997 is about 634.5881529730.

The spelling of 255549997 in words is "two hundred fifty-five million, five hundred forty-nine thousand, nine hundred ninety-seven".