11911210957 has 2 divisors, whose sum is σ = 11911210958. Its totient is φ = 11911210956.

The previous prime is 11911210907. The next prime is 11911210991. The reversal of 11911210957 is 75901211911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6873902281 + 5037308676 = 82909^2 + 70974^2 .

It is a cyclic number.

It is not a de Polignac number, because 11911210957 - 2¹¹ = 11911208909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11911210907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5955605478 + 5955605479.

It is an arithmetic number, because the mean of its divisors is an integer number (5955605479).

Almost surely, 2^11911210957 is an apocalyptic number.

It is an amenable number.

11911210957 is a deficient number, since it is larger than the sum of its proper divisors (1).

11911210957 is an equidigital number, since it uses as much as digits as its factorization.

11911210957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 37.

The spelling of 11911210957 in words is "eleven billion, nine hundred eleven million, two hundred ten thousand, nine hundred fifty-seven".