1255421 has 2 divisors, whose sum is σ = 1255422. Its totient is φ = 1255420.

The previous prime is 1255393. The next prime is 1255427. The reversal of 1255421 is 1245521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912025 + 343396 = 955^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255421 - 2⁶ = 1255357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1255393 and 1255402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627710 + 627711.

It is an arithmetic number, because the mean of its divisors is an integer number (627711).

2^1255421 is an apocalyptic number.

It is an amenable number.

1255421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255421 is an equidigital number, since it uses as much as digits as its factorization.

1255421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 20.

The square root of 1255421 is about 1120.4557108605. The cubic root of 1255421 is about 107.8772324693.

The spelling of 1255421 in words is "one million, two hundred fifty-five thousand, four hundred twenty-one".