1321831201 has 4 divisors (see below), whose sum is σ = 1324686592. Its totient is φ = 1318975812.

The previous prime is 1321831187. The next prime is 1321831207. The reversal of 1321831201 is 1021381231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321831201 - 2⁹ = 1321830689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321831207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427001 + ... + 1427926.

It is an arithmetic number, because the mean of its divisors is an integer number (331171648).

Almost surely, 2^1321831201 is an apocalyptic number.

It is an amenable number.

1321831201 is a deficient number, since it is larger than the sum of its proper divisors (2855391).

1321831201 is an equidigital number, since it uses as much as digits as its factorization.

1321831201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855390.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1321831201 is about 36356.9965893774. The cubic root of 1321831201 is about 1097.4683378769.

The spelling of 1321831201 in words is "one billion, three hundred twenty-one million, eight hundred thirty-one thousand, two hundred one".