943981587691 has 2 divisors, whose sum is σ = 943981587692. Its totient is φ = 943981587690.

The previous prime is 943981587613. The next prime is 943981587727. The reversal of 943981587691 is 196785189349.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-943981587691 is a prime.

It is a super-2 number, since 2×943981587691² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 943981587691.

It is not a weakly prime, because it can be changed into another prime (943981587091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 471990793845 + 471990793846.

It is an arithmetic number, because the mean of its divisors is an integer number (471990793846).

Almost surely, 2^943981587691 is an apocalyptic number.

943981587691 is a deficient number, since it is larger than the sum of its proper divisors (1).

943981587691 is an equidigital number, since it uses as much as digits as its factorization.

943981587691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117573120, while the sum is 70.

The spelling of 943981587691 in words is "nine hundred forty-three billion, nine hundred eighty-one million, five hundred eighty-seven thousand, six hundred ninety-one".