1231420009 has 2 divisors, whose sum is σ = 1231420010. Its totient is φ = 1231420008.

The previous prime is 1231419997. The next prime is 1231420027. The reversal of 1231420009 is 9000241321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900180009 + 331240000 = 30003^2 + 18200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231420009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231420079) 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 as a sum of consecutive naturals, namely, 615710004 + 615710005.

It is an arithmetic number, because the mean of its divisors is an integer number (615710005).

Almost surely, 2^1231420009 is an apocalyptic number.

It is an amenable number.

1231420009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231420009 is an equidigital number, since it uses as much as digits as its factorization.

1231420009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1231420009 is about 35091.5945633709. The cubic root of 1231420009 is about 1071.8534298872.

It can be divided in two parts, 12314 and 20009, that added together give a palindrome (32323).

The spelling of 1231420009 in words is "one billion, two hundred thirty-one million, four hundred twenty thousand, nine".