1361323121 has 4 divisors (see below), whose sum is σ = 1362644544. Its totient is φ = 1360001700.

The previous prime is 1361323081. The next prime is 1361323141. The reversal of 1361323121 is 1213231631.

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 1361323121 - 2¹⁰ = 1361322097 is a prime.

It is a super-3 number, since 3×1361323121³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361323141) 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 3 ways as a sum of consecutive naturals, for example, 659165 + ... + 661226.

It is an arithmetic number, because the mean of its divisors is an integer number (340661136).

Almost surely, 2^1361323121 is an apocalyptic number.

It is an amenable number.

1361323121 is a deficient number, since it is larger than the sum of its proper divisors (1321423).

1361323121 is a wasteful number, since it uses less digits than its factorization.

1361323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321422.

The product of its digits is 648, while the sum is 23.

The square root of 1361323121 is about 36896.1125459038. The cubic root of 1361323121 is about 1108.2908308850.

Adding to 1361323121 its reverse (1213231631), we get a palindrome (2574554752).

The spelling of 1361323121 in words is "one billion, three hundred sixty-one million, three hundred twenty-three thousand, one hundred twenty-one".