1241267738891 has 4 divisors (see below), whose sum is σ = 1241270682000. Its totient is φ = 1241264795784.

The previous prime is 1241267738873. The next prime is 1241267738897. The reversal of 1241267738891 is 1988377621421.

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 1241267738891 - 2²⁶ = 1241200630027 is a prime.

It is a super-2 number, since 2×1241267738891² (a number of 25 digits) contains 22 as substring.

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 1241267738891.

It is not an unprimeable number, because it can be changed into a prime (1241267738897) 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, 706256 + ... + 1726653.

It is an arithmetic number, because the mean of its divisors is an integer number (310317670500).

Almost surely, 2^{1241267738891} is an apocalyptic number.

1241267738891 is a deficient number, since it is larger than the sum of its proper divisors (2943109).

1241267738891 is an equidigital number, since it uses as much as digits as its factorization.

1241267738891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943108.

The product of its digits is 8128512, while the sum is 59.

The spelling of 1241267738891 in words is "one trillion, two hundred forty-one billion, two hundred sixty-seven million, seven hundred thirty-eight thousand, eight hundred ninety-one".