13961377979 has 2 divisors, whose sum is σ = 13961377980. Its totient is φ = 13961377978.

The previous prime is 13961377957. The next prime is 13961377999. The reversal of 13961377979 is 97977316931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13961377979 - 2²⁰ = 13960329403 is a prime.

It is a super-2 number, since 2×13961377979² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13961377999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6980688989 + 6980688990.

It is an arithmetic number, because the mean of its divisors is an integer number (6980688990).

Almost surely, 2^13961377979 is an apocalyptic number.

13961377979 is a deficient number, since it is larger than the sum of its proper divisors (1).

13961377979 is an equidigital number, since it uses as much as digits as its factorization.

13961377979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13502538, while the sum is 62.

The spelling of 13961377979 in words is "thirteen billion, nine hundred sixty-one million, three hundred seventy-seven thousand, nine hundred seventy-nine".