1201321313 has 4 divisors (see below), whose sum is σ = 1201390740. Its totient is φ = 1201251888.

The previous prime is 1201321273. The next prime is 1201321327. The reversal of 1201321313 is 3131231021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3131231021 = 2383 ⋅1313987.

It can be written as a sum of positive squares in 2 ways, for example, as 1173199504 + 28121809 = 34252^2 + 5303^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201321313 - 2⁶ = 1201321249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201321291 and 1201321300.

It is not an unprimeable number, because it can be changed into a prime (1201321343) 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, 14483 + ... + 51111.

It is an arithmetic number, because the mean of its divisors is an integer number (300347685).

Almost surely, 2^1201321313 is an apocalyptic number.

It is an amenable number.

1201321313 is a deficient number, since it is larger than the sum of its proper divisors (69427).

1201321313 is an equidigital number, since it uses as much as digits as its factorization.

1201321313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69426.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1201321313 is about 34660.0824147895. The cubic root of 1201321313 is about 1063.0484551678.

Adding to 1201321313 its reverse (3131231021), we get a palindrome (4332552334).

The spelling of 1201321313 in words is "one billion, two hundred one million, three hundred twenty-one thousand, three hundred thirteen".