1212561043 has 4 divisors (see below), whose sum is σ = 1215585288. Its totient is φ = 1209536800.

The previous prime is 1212561029. The next prime is 1212561047. The reversal of 1212561043 is 3401652121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212561043 - 2¹³ = 1212552851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212560999 and 1212561017.

It is not an unprimeable number, because it can be changed into a prime (1212561047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511521 + ... + 1512322.

It is an arithmetic number, because the mean of its divisors is an integer number (303896322).

Almost surely, 2^1212561043 is an apocalyptic number.

1212561043 is a deficient number, since it is larger than the sum of its proper divisors (3024245).

1212561043 is an equidigital number, since it uses as much as digits as its factorization.

1212561043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024244.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1212561043 is about 34821.8472083260. The cubic root of 1212561043 is about 1066.3535122499.

The spelling of 1212561043 in words is "one billion, two hundred twelve million, five hundred sixty-one thousand, forty-three".