1320321431 has 16 divisors (see below), whose sum is σ = 1593076128. Its totient is φ = 1078012800.

The previous prime is 1320321427. The next prime is 1320321449. The reversal of 1320321431 is 1341230231.

It is a cyclic number.

It is not a de Polignac number, because 1320321431 - 2² = 1320321427 is a prime.

It is a super-2 number, since 2×1320321431² = 3486497362315775522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320321451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119480 + ... + 130061.

It is an arithmetic number, because the mean of its divisors is an integer number (99567258).

Almost surely, 2^1320321431 is an apocalyptic number.

1320321431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320321431 is a deficient number, since it is larger than the sum of its proper divisors (272754697).

1320321431 is a wasteful number, since it uses less digits than its factorization.

1320321431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249602.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1320321431 is about 36336.2275284598. The cubic root of 1320321431 is about 1097.0503430003.

Adding to 1320321431 its reverse (1341230231), we get a palindrome (2661551662).

The spelling of 1320321431 in words is "one billion, three hundred twenty million, three hundred twenty-one thousand, four hundred thirty-one".