7913191103989 has 2 divisors, whose sum is σ = 7913191103990. Its totient is φ = 7913191103988.

The previous prime is 7913191103963. The next prime is 7913191104041. The reversal of 7913191103989 is 9893011913197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7909830003364 + 3361100625 = 2812442^2 + 57975^2 .

It is a cyclic number.

It is not a de Polignac number, because 7913191103989 - 2⁵ = 7913191103957 is a prime.

It is a super-2 number, since 2×7913191103989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7913191103089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3956595551994 + 3956595551995.

It is an arithmetic number, because the mean of its divisors is an integer number (3956595551995).

Almost surely, 2^{7913191103989} is an apocalyptic number.

It is an amenable number.

7913191103989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7913191103989 is an equidigital number, since it uses as much as digits as its factorization.

7913191103989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 61.

The spelling of 7913191103989 in words is "seven trillion, nine hundred thirteen billion, one hundred ninety-one million, one hundred three thousand, nine hundred eighty-nine".