1231212043 has 4 divisors (see below), whose sum is σ = 1231443688. Its totient is φ = 1230980400.

The previous prime is 1231211987. The next prime is 1231212049. The reversal of 1231212043 is 3402121321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3402121321 = 149 ⋅22833029.

It is a cyclic number.

It is not a de Polignac number, because 1231212043 - 2¹⁷ = 1231080971 is a prime.

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 1231212043.

It is not an unprimeable number, because it can be changed into a prime (1231212049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107658 + ... + 118543.

It is an arithmetic number, because the mean of its divisors is an integer number (307860922).

Almost surely, 2^1231212043 is an apocalyptic number.

1231212043 is a deficient number, since it is larger than the sum of its proper divisors (231645).

1231212043 is an equidigital number, since it uses as much as digits as its factorization.

1231212043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231644.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1231212043 is about 35088.6312500217. The cubic root of 1231212043 is about 1071.7930871884.

Adding to 1231212043 its reverse (3402121321), we get a palindrome (4633333364).

The spelling of 1231212043 in words is "one billion, two hundred thirty-one million, two hundred twelve thousand, forty-three".