1391069 has 4 divisors (see below), whose sum is σ = 1394940. Its totient is φ = 1387200.

The previous prime is 1391057. The next prime is 1391081. The reversal of 1391069 is 9601931.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1391057) and next prime (1391081).

It can be written as a sum of positive squares in 2 ways, for example, as 743044 + 648025 = 862^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391069 - 2⁸ = 1390813 is a prime.

It is a super-2 number, since 2×1391069² = 3870145925522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334 + ... + 2135.

It is an arithmetic number, because the mean of its divisors is an integer number (348735).

2^1391069 is an apocalyptic number.

It is an amenable number.

1391069 is a deficient number, since it is larger than the sum of its proper divisors (3871).

1391069 is an equidigital number, since it uses as much as digits as its factorization.

1391069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1391069 is about 1179.4358821064. The cubic root of 1391069 is about 111.6305053575.

The spelling of 1391069 in words is "one million, three hundred ninety-one thousand, sixty-nine".