1321263 has 6 divisors (see below), whose sum is σ = 1908504. Its totient is φ = 880836.

The previous prime is 1321259. The next prime is 1321267. The reversal of 1321263 is 3621231.

It is an interprime number because it is at equal distance from previous prime (1321259) and next prime (1321267).

It is not a de Polignac number, because 1321263 - 2² = 1321259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73395 + ... + 73412.

It is an arithmetic number, because the mean of its divisors is an integer number (318084).

2^1321263 is an apocalyptic number.

1321263 is a deficient number, since it is larger than the sum of its proper divisors (587241).

1321263 is a wasteful number, since it uses less digits than its factorization.

1321263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146813 (or 146810 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 1321263 is about 1149.4620480903. The cubic root of 1321263 is about 109.7311063136.

Adding to 1321263 its reverse (3621231), we get a palindrome (4942494).

Subtracting 1321263 from its reverse (3621231), we obtain a cube (2299968 = 132³).

The spelling of 1321263 in words is "one million, three hundred twenty-one thousand, two hundred sixty-three".