13961377989 has 48 divisors (see below), whose sum is σ = 22168049904. Its totient is φ = 8414668800.

The previous prime is 13961377979. The next prime is 13961377999. The reversal of 13961377989 is 98977316931.

13961377989 is a `hidden beast` number, since 1 + 3 + 9 + 613 + 7 + 7 + 9 + 8 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (13961377979) and next prime (13961377999).

It can be written as a sum of positive squares in 8 ways, for example, as 229522500 + 13731855489 = 15150^2 + 117183^2 .

It is not a de Polignac number, because 13961377989 - 2⁵ = 13961377957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13961377979) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1715959 + ... + 1724075.

It is an arithmetic number, because the mean of its divisors is an integer number (461834373).

Almost surely, 2^13961377989 is an apocalyptic number.

It is an amenable number.

13961377989 is a deficient number, since it is larger than the sum of its proper divisors (8206671915).

13961377989 is a wasteful number, since it uses less digits than its factorization.

13961377989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8438 (or 8435 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 63.

The spelling of 13961377989 in words is "thirteen billion, nine hundred sixty-one million, three hundred seventy-seven thousand, nine hundred eighty-nine".