1231200043 has 2 divisors, whose sum is σ = 1231200044. Its totient is φ = 1231200042.

The previous prime is 1231200031. The next prime is 1231200059. The reversal of 1231200043 is 3400021321.

It is a happy number.

It is an a-pointer prime, because the next prime (1231200059) can be obtained adding 1231200043 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231200043 - 2²¹ = 1229102891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231200083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615600021 + 615600022.

It is an arithmetic number, because the mean of its divisors is an integer number (615600022).

Almost surely, 2^1231200043 is an apocalyptic number.

1231200043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231200043 is an equidigital number, since it uses as much as digits as its factorization.

1231200043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1231200043 is about 35088.4602540493. The cubic root of 1231200043 is about 1071.7896051023.

Adding to 1231200043 its reverse (3400021321), we get a palindrome (4631221364).

The spelling of 1231200043 in words is "one billion, two hundred thirty-one million, two hundred thousand, forty-three".