1023391 has 2 divisors, whose sum is σ = 1023392. Its totient is φ = 1023390.

The previous prime is 1023389. The next prime is 1023409. The reversal of 1023391 is 1933201.

1023391 is nontrivially palindromic in base 16.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1023391 - 2¹ = 1023389 is a prime.

Together with 1023389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511695 + 511696.

It is an arithmetic number, because the mean of its divisors is an integer number (511696).

2^1023391 is an apocalyptic number.

1023391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023391 is an equidigital number, since it uses as much as digits as its factorization.

1023391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1023391 is about 1011.6278960171. The cubic root of 1023391 is about 100.7736984687.

Adding to 1023391 its reverse (1933201), we get a palindrome (2956592).

It can be divided in two parts, 1023 and 391, that multiplied together give a palindrome (399993).

The spelling of 1023391 in words is "one million, twenty-three thousand, three hundred ninety-one".