13749961 has 2 divisors, whose sum is σ = 13749962. Its totient is φ = 13749960.

The previous prime is 13749959. The next prime is 13749971. The reversal of 13749961 is 16994731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8156736 + 5593225 = 2856^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 13749961 - 2¹ = 13749959 is a prime.

It is a super-2 number, since 2×13749961² = 378122855003042, which contains 22 as substring.

Together with 13749959, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13749971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6874980 + 6874981.

It is an arithmetic number, because the mean of its divisors is an integer number (6874981).

Almost surely, 2^13749961 is an apocalyptic number.

It is an amenable number.

13749961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13749961 is an equidigital number, since it uses as much as digits as its factorization.

13749961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 13749961 is about 3708.0939847852. The cubic root of 13749961 is about 239.5707663494.

The spelling of 13749961 in words is "thirteen million, seven hundred forty-nine thousand, nine hundred sixty-one".