13971921289 has 2 divisors, whose sum is σ = 13971921290. Its totient is φ = 13971921288.

The previous prime is 13971921239. The next prime is 13971921331. The reversal of 13971921289 is 98212917931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13855173264 + 116748025 = 117708^2 + 10805^2 .

It is a cyclic number.

It is not a de Polignac number, because 13971921289 - 2¹⁵ = 13971888521 is a prime.

It is a super-2 number, since 2×13971921289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13971921209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6985960644 + 6985960645.

It is an arithmetic number, because the mean of its divisors is an integer number (6985960645).

Almost surely, 2^13971921289 is an apocalyptic number.

It is an amenable number.

13971921289 is a deficient number, since it is larger than the sum of its proper divisors (1).

13971921289 is an equidigital number, since it uses as much as digits as its factorization.

13971921289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 52.

The spelling of 13971921289 in words is "thirteen billion, nine hundred seventy-one million, nine hundred twenty-one thousand, two hundred eighty-nine".