11943900491 has 2 divisors, whose sum is σ = 11943900492. Its totient is φ = 11943900490.

The previous prime is 11943900439. The next prime is 11943900569. The reversal of 11943900491 is 19400934911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11943900491 - 2¹⁸ = 11943638347 is a prime.

It is not a weakly prime, because it can be changed into another prime (11943900091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5971950245 + 5971950246.

It is an arithmetic number, because the mean of its divisors is an integer number (5971950246).

Almost surely, 2^11943900491 is an apocalyptic number.

11943900491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11943900491 is an equidigital number, since it uses as much as digits as its factorization.

11943900491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 11943900491 in words is "eleven billion, nine hundred forty-three million, nine hundred thousand, four hundred ninety-one".