13719961 has 2 divisors, whose sum is σ = 13719962. Its totient is φ = 13719960.

The previous prime is 13719947. The next prime is 13719991. The reversal of 13719961 is 16991731.

13719961 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11095561 + 2624400 = 3331^2 + 1620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13719961 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13719961.

It is not a weakly prime, because it can be changed into another prime (13719991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6859980 + 6859981.

It is an arithmetic number, because the mean of its divisors is an integer number (6859981).

Almost surely, 2^13719961 is an apocalyptic number.

13719961 is the 1657-th centered decagonal number.

It is an amenable number.

13719961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13719961 is an equidigital number, since it uses as much as digits as its factorization.

13719961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 13719961 is about 3704.0465709815. The cubic root of 13719961 is about 239.3964057010.

The spelling of 13719961 in words is "thirteen million, seven hundred nineteen thousand, nine hundred sixty-one".