1255391 has 2 divisors, whose sum is σ = 1255392. Its totient is φ = 1255390.

The previous prime is 1255367. The next prime is 1255393. The reversal of 1255391 is 1935521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1255391 - 2¹⁰ = 1254367 is a prime.

Together with 1255393, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627695 + 627696.

It is an arithmetic number, because the mean of its divisors is an integer number (627696).

2^1255391 is an apocalyptic number.

1255391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255391 is an equidigital number, since it uses as much as digits as its factorization.

1255391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 26.

The square root of 1255391 is about 1120.4423233706. The cubic root of 1255391 is about 107.8763731712.

The spelling of 1255391 in words is "one million, two hundred fifty-five thousand, three hundred ninety-one".