13404961 has 2 divisors, whose sum is σ = 13404962. Its totient is φ = 13404960.

The previous prime is 13404947. The next prime is 13404967. The reversal of 13404961 is 16940431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9579025 + 3825936 = 3095^2 + 1956^2 .

It is an emirp because it is prime and its reverse (16940431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13404961 - 2¹¹ = 13402913 is a prime.

It is not a weakly prime, because it can be changed into another prime (13404967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6702480 + 6702481.

It is an arithmetic number, because the mean of its divisors is an integer number (6702481).

Almost surely, 2^13404961 is an apocalyptic number.

It is an amenable number.

13404961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13404961 is an equidigital number, since it uses as much as digits as its factorization.

13404961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 13404961 is about 3661.2786018002. The cubic root of 13404961 is about 237.5500821438.

It can be divided in two parts, 13404 and 961, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 13404961 in words is "thirteen million, four hundred four thousand, nine hundred sixty-one".