1213346431 has 16 divisors (see below), whose sum is σ = 1339388928. Its totient is φ = 1089972000.

The previous prime is 1213346383. The next prime is 1213346447. The reversal of 1213346431 is 1346433121.

It is a cyclic number.

It is not a de Polignac number, because 1213346431 - 2⁹ = 1213345919 is a prime.

It is a super-2 number, since 2×1213346431² = 2944419123240875522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213346431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213346731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 913690 + ... + 915016.

It is an arithmetic number, because the mean of its divisors is an integer number (83711808).

Almost surely, 2^1213346431 is an apocalyptic number.

1213346431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213346431 is a deficient number, since it is larger than the sum of its proper divisors (126042497).

1213346431 is a wasteful number, since it uses less digits than its factorization.

1213346431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262.

The product of its digits is 5184, while the sum is 28.

The square root of 1213346431 is about 34833.1226133977. The cubic root of 1213346431 is about 1066.5836918638.

Adding to 1213346431 its reverse (1346433121), we get a palindrome (2559779552).

It can be divided in two parts, 121334 and 6431, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 1213346431 in words is "one billion, two hundred thirteen million, three hundred forty-six thousand, four hundred thirty-one".