1255540409 has 2 divisors, whose sum is σ = 1255540410. Its totient is φ = 1255540408.

The previous prime is 1255540367. The next prime is 1255540421. The reversal of 1255540409 is 9040455521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 735928384 + 519612025 = 27128^2 + 22795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255540409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255540309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627770204 + 627770205.

It is an arithmetic number, because the mean of its divisors is an integer number (627770205).

Almost surely, 2^1255540409 is an apocalyptic number.

It is an amenable number.

1255540409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255540409 is an equidigital number, since it uses as much as digits as its factorization.

1255540409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 1255540409 is about 35433.6056449241. The cubic root of 1255540409 is about 1078.8065259797.

The spelling of 1255540409 in words is "one billion, two hundred fifty-five million, five hundred forty thousand, four hundred nine".