1213225331 has 4 divisors (see below), whose sum is σ = 1252361664. Its totient is φ = 1174089000.

The previous prime is 1213225327. The next prime is 1213225333. The reversal of 1213225331 is 1335223121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213225331 - 2² = 1213225327 is a prime.

It is a super-2 number, since 2×1213225331² = 2943831407560119122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213225297 and 1213225306.

It is not an unprimeable number, because it can be changed into a prime (1213225333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19568120 + ... + 19568181.

It is an arithmetic number, because the mean of its divisors is an integer number (313090416).

Almost surely, 2^1213225331 is an apocalyptic number.

1213225331 is a deficient number, since it is larger than the sum of its proper divisors (39136333).

1213225331 is an equidigital number, since it uses as much as digits as its factorization.

1213225331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39136332.

The product of its digits is 1080, while the sum is 23.

The square root of 1213225331 is about 34831.3842819949. The cubic root of 1213225331 is about 1066.5482066473.

Adding to 1213225331 its reverse (1335223121), we get a palindrome (2548448452).

The spelling of 1213225331 in words is "one billion, two hundred thirteen million, two hundred twenty-five thousand, three hundred thirty-one".