11910237989 has 24 divisors (see below), whose sum is σ = 13618022040. Its totient is φ = 10414737216.

The previous prime is 11910237979. The next prime is 11910238007. The reversal of 11910237989 is 98973201911.

It can be written as a sum of positive squares in 4 ways, for example, as 4567461889 + 7342776100 = 67583^2 + 85690^2 .

It is not a de Polignac number, because 11910237989 - 2⁸ = 11910237733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11910237929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 785609 + ... + 800625.

It is an arithmetic number, because the mean of its divisors is an integer number (567417585).

Almost surely, 2^11910237989 is an apocalyptic number.

11910237989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11910237989 is a deficient number, since it is larger than the sum of its proper divisors (1707784051).

11910237989 is an equidigital number, since it uses as much as digits as its factorization.

11910237989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15094 (or 15049 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 50.

The spelling of 11910237989 in words is "eleven billion, nine hundred ten million, two hundred thirty-seven thousand, nine hundred eighty-nine".