17911081943 has 2 divisors, whose sum is σ = 17911081944. Its totient is φ = 17911081942.

The previous prime is 17911081831. The next prime is 17911081949. The reversal of 17911081943 is 34918011971.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17911081943 is a prime.

It is a super-4 number, since 4×17911081943⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 17911081894 and 17911081903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17911081949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8955540971 + 8955540972.

It is an arithmetic number, because the mean of its divisors is an integer number (8955540972).

Almost surely, 2^17911081943 is an apocalyptic number.

17911081943 is a deficient number, since it is larger than the sum of its proper divisors (1).

17911081943 is an equidigital number, since it uses as much as digits as its factorization.

17911081943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 44.

The spelling of 17911081943 in words is "seventeen billion, nine hundred eleven million, eighty-one thousand, nine hundred forty-three".