16961409 has 6 divisors (see below), whose sum is σ = 24499826. Its totient is φ = 11307600.

The previous prime is 16961389. The next prime is 16961411. The reversal of 16961409 is 90416961.

It can be written as a sum of positive squares in only one way, i.e., 10909809 + 6051600 = 3303^2 + 2460^2 .

It is not a de Polignac number, because 16961409 - 2¹¹ = 16959361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16961449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 942292 + ... + 942309.

Almost surely, 2^16961409 is an apocalyptic number.

It is an amenable number.

16961409 is a deficient number, since it is larger than the sum of its proper divisors (7538417).

16961409 is a wasteful number, since it uses less digits than its factorization.

16961409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884607 (or 1884604 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 16961409 is about 4118.4231205645. The cubic root of 16961409 is about 256.9334463062.

The spelling of 16961409 in words is "sixteen million, nine hundred sixty-one thousand, four hundred nine".