1255021 has 2 divisors, whose sum is σ = 1255022. Its totient is φ = 1255020.

The previous prime is 1255013. The next prime is 1255039. The reversal of 1255021 is 1205521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1179396 + 75625 = 1086^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255021 - 2³ = 1255013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1254986 and 1255004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627510 + 627511.

It is an arithmetic number, because the mean of its divisors is an integer number (627511).

2^1255021 is an apocalyptic number.

It is an amenable number.

1255021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255021 is an equidigital number, since it uses as much as digits as its factorization.

1255021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1255021 is about 1120.2771978399. The cubic root of 1255021 is about 107.8657740351.

The spelling of 1255021 in words is "one million, two hundred fifty-five thousand, twenty-one".