1213023431 has 4 divisors (see below), whose sum is σ = 1216460112. Its totient is φ = 1209586752.

The previous prime is 1213023419. The next prime is 1213023437. The reversal of 1213023431 is 1343203121.

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 1213023431 - 2⁶ = 1213023367 is a prime.

It is a super-2 number, since 2×1213023431² = 2942851688310023522, 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 (1213023437) 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, 1717811 + ... + 1718516.

It is an arithmetic number, because the mean of its divisors is an integer number (304115028).

Almost surely, 2^1213023431 is an apocalyptic number.

1213023431 is a deficient number, since it is larger than the sum of its proper divisors (3436681).

1213023431 is an equidigital number, since it uses as much as digits as its factorization.

1213023431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436680.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1213023431 is about 34828.4859131143. The cubic root of 1213023431 is about 1066.4890398342.

Adding to 1213023431 its reverse (1343203121), we get a palindrome (2556226552).

The spelling of 1213023431 in words is "one billion, two hundred thirteen million, twenty-three thousand, four hundred thirty-one".