1321431 has 16 divisors (see below), whose sum is σ = 1881600. Its totient is φ = 822528.

The previous prime is 1321429. The next prime is 1321447. The reversal of 1321431 is 1341231.

It is not a de Polignac number, because 1321431 - 2¹ = 1321429 is a prime.

It is a super-2 number, since 2×1321431² = 3492359775522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5410 + ... + 5648.

It is an arithmetic number, because the mean of its divisors is an integer number (117600).

2^1321431 is an apocalyptic number.

1321431 is a deficient number, since it is larger than the sum of its proper divisors (560169).

1321431 is a wasteful number, since it uses less digits than its factorization.

1321431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its digits is 72, while the sum is 15.

The square root of 1321431 is about 1149.5351234303. The cubic root of 1321431 is about 109.7357569256.

Adding to 1321431 its reverse (1341231), we get a palindrome (2662662).

The spelling of 1321431 in words is "one million, three hundred twenty-one thousand, four hundred thirty-one".