1255540081 has 2 divisors, whose sum is σ = 1255540082. Its totient is φ = 1255540080.

The previous prime is 1255540079. The next prime is 1255540133. The reversal of 1255540081 is 1800455521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222131681 + 33408400 = 34959^2 + 5780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255540081 - 2¹ = 1255540079 is a prime.

It is a super-2 number, since 2×1255540081² = 3152761789994973122, which contains 22 as substring.

Together with 1255540079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1255540681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627770040 + 627770041.

It is an arithmetic number, because the mean of its divisors is an integer number (627770041).

Almost surely, 2^1255540081 is an apocalyptic number.

It is an amenable number.

1255540081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255540081 is an equidigital number, since it uses as much as digits as its factorization.

1255540081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 1255540081 is about 35433.6010165492. The cubic root of 1255540081 is about 1078.8064320364.

The spelling of 1255540081 in words is "one billion, two hundred fifty-five million, five hundred forty thousand, eighty-one".