1231023213 has 12 divisors (see below), whose sum is σ = 2032165408. Its totient is φ = 703441800.

The previous prime is 1231023187. The next prime is 1231023223. The reversal of 1231023213 is 3123201321.

It is not a de Polignac number, because 1231023213 - 2⁶ = 1231023149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231023223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9769963 + ... + 9770088.

Almost surely, 2^1231023213 is an apocalyptic number.

It is an amenable number.

1231023213 is a deficient number, since it is larger than the sum of its proper divisors (801142195).

1231023213 is a wasteful number, since it uses less digits than its factorization.

1231023213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19540064 (or 19540061 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1231023213 is about 35085.9403892784. The cubic root of 1231023213 is about 1071.7382910393.

Adding to 1231023213 its reverse (3123201321), we get a palindrome (4354224534).

The spelling of 1231023213 in words is "one billion, two hundred thirty-one million, twenty-three thousand, two hundred thirteen".