1212041791 has 4 divisors (see below), whose sum is σ = 1212141312. Its totient is φ = 1211942272.

The previous prime is 1212041767. The next prime is 1212041801. The reversal of 1212041791 is 1971402121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1971402121 = 13 ⋅151646317.

It is a cyclic number.

It is not a de Polignac number, because 1212041791 - 2⁵ = 1212041759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212041291) 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, 28450 + ... + 56863.

It is an arithmetic number, because the mean of its divisors is an integer number (303035328).

Almost surely, 2^1212041791 is an apocalyptic number.

1212041791 is a deficient number, since it is larger than the sum of its proper divisors (99521).

1212041791 is an equidigital number, since it uses as much as digits as its factorization.

1212041791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99520.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1212041791 is about 34814.3905734396. The cubic root of 1212041791 is about 1066.2012765465.

The spelling of 1212041791 in words is "one billion, two hundred twelve million, forty-one thousand, seven hundred ninety-one".