1050391 has 2 divisors, whose sum is σ = 1050392.
Its totient is φ = 1050390.
The previous prime is 1050367. The next prime is 1050421. The reversal of 1050391 is 1930501.
Adding to 1050391 its reverse (1930501), we get a palindrome (2980892).
It can be divided in two parts, 1050 and 391, that added together give a palindrome (1441).
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 1050391 - 211 = 1048343 is a prime.
It is a super-2 number, since 2×10503912 = 2206642505762, which contains 22 as substring.
1050391 is a lucky number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1050331) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525195 + 525196.
It is an arithmetic number, because the mean of its divisors is an integer number (525196).
21050391 is an apocalyptic number.
1050391 is a deficient number, since it is larger than the sum of its proper divisors (1).
1050391 is an equidigital number, since it uses as much as digits as its factorization.
1050391 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 135, while the sum is 19.
The square root of 1050391 is about 1024.8858473020.
The cubic root of 1050391 is about 101.6522503372.
The spelling of 1050391 in words is "one million, fifty thousand, three hundred ninety-one".