1213144431 has 16 divisors (see below), whose sum is σ = 1637302368. Its totient is φ = 798912000.

The previous prime is 1213144417. The next prime is 1213144481. The reversal of 1213144431 is 1344413121.

It is not a de Polignac number, because 1213144431 - 2²⁹ = 676273519 is a prime.

It is a super-2 number, since 2×1213144431² = 2943438820932627522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213144481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134091 + ... + 142851.

It is an arithmetic number, because the mean of its divisors is an integer number (102331398).

Almost surely, 2^1213144431 is an apocalyptic number.

1213144431 is a deficient number, since it is larger than the sum of its proper divisors (424157937).

1213144431 is a wasteful number, since it uses less digits than its factorization.

1213144431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9322.

The product of its digits is 1152, while the sum is 24.

The square root of 1213144431 is about 34830.2229536361. Note that the first 3 decimals coincide. The cubic root of 1213144431 is about 1066.5244996832.

Adding to 1213144431 its reverse (1344413121), we get a palindrome (2557557552).

The spelling of 1213144431 in words is "one billion, two hundred thirteen million, one hundred forty-four thousand, four hundred thirty-one".