13961807989 has 2 divisors, whose sum is σ = 13961807990. Its totient is φ = 13961807988.

The previous prime is 13961807969. The next prime is 13961808001. The reversal of 13961807989 is 98970816931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13313698225 + 648109764 = 115385^2 + 25458^2 .

It is a cyclic number.

It is not a de Polignac number, because 13961807989 - 2⁹ = 13961807477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13961807969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6980903994 + 6980903995.

It is an arithmetic number, because the mean of its divisors is an integer number (6980903995).

Almost surely, 2^13961807989 is an apocalyptic number.

It is an amenable number.

13961807989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13961807989 is an equidigital number, since it uses as much as digits as its factorization.

13961807989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 13961807989 in words is "thirteen billion, nine hundred sixty-one million, eight hundred seven thousand, nine hundred eighty-nine".