1131121613 has 4 divisors (see below), whose sum is σ = 1131470688. Its totient is φ = 1130772540.

The previous prime is 1131121573. The next prime is 1131121631. The reversal of 1131121613 is 3161211311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3161211311 = 24551 ⋅128761.

It is a cyclic number.

It is not a de Polignac number, because 1131121613 - 2⁶ = 1131121549 is a prime.

It is a super-2 number, since 2×1131121613² = 2558872206791443538, 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 (1131121643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169631 + ... + 176172.

It is an arithmetic number, because the mean of its divisors is an integer number (282867672).

Almost surely, 2^1131121613 is an apocalyptic number.

It is an amenable number.

1131121613 is a deficient number, since it is larger than the sum of its proper divisors (349075).

1131121613 is an equidigital number, since it uses as much as digits as its factorization.

1131121613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349074.

The product of its digits is 108, while the sum is 20.

The square root of 1131121613 is about 33632.1514774182. The cubic root of 1131121613 is about 1041.9249399159.

Adding to 1131121613 its reverse (3161211311), we get a palindrome (4292332924).

The spelling of 1131121613 in words is "one billion, one hundred thirty-one million, one hundred twenty-one thousand, six hundred thirteen".