1270391 has 2 divisors, whose sum is σ = 1270392. Its totient is φ = 1270390.

The previous prime is 1270361. The next prime is 1270417. The reversal of 1270391 is 1930721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1270391 - 2⁶ = 1270327 is a prime.

It is a super-2 number, since 2×1270391² = 3227786585762, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1270301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635195 + 635196.

It is an arithmetic number, because the mean of its divisors is an integer number (635196).

2^1270391 is an apocalyptic number.

1270391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1270391 is an equidigital number, since it uses as much as digits as its factorization.

1270391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 1270391 is about 1127.1162318058. The cubic root of 1270391 is about 108.3043256984.

It can be divided in two parts, 1270 and 391, that added together give a palindrome (1661).

The spelling of 1270391 in words is "one million, two hundred seventy thousand, three hundred ninety-one".