1213631135 has 4 divisors (see below), whose sum is σ = 1456357368. Its totient is φ = 970904904.

The previous prime is 1213631057. The next prime is 1213631143. The reversal of 1213631135 is 5311363121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5311363121 = 2551 ⋅2082071.

It is a cyclic number.

It is not a de Polignac number, because 1213631135 - 2²⁰ = 1212582559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121363109 + ... + 121363118.

It is an arithmetic number, because the mean of its divisors is an integer number (364089342).

Almost surely, 2^1213631135 is an apocalyptic number.

1213631135 is a deficient number, since it is larger than the sum of its proper divisors (242726233).

1213631135 is an equidigital number, since it uses as much as digits as its factorization.

1213631135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242726232.

The product of its digits is 1620, while the sum is 26.

The square root of 1213631135 is about 34837.2090587062. The cubic root of 1213631135 is about 1066.6671076930.

Adding to 1213631135 its reverse (5311363121), we get a palindrome (6524994256).

The spelling of 1213631135 in words is "one billion, two hundred thirteen million, six hundred thirty-one thousand, one hundred thirty-five".