16945649 has 4 divisors (see below), whose sum is σ = 19366464. Its totient is φ = 14524836.

The previous prime is 16945639. The next prime is 16945661. The reversal of 16945649 is 94654961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16945649 - 2²⁴ = 168433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16945639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210397 + ... + 1210410.

It is an arithmetic number, because the mean of its divisors is an integer number (4841616).

Almost surely, 2^16945649 is an apocalyptic number.

It is an amenable number.

16945649 is a deficient number, since it is larger than the sum of its proper divisors (2420815).

16945649 is an equidigital number, since it uses as much as digits as its factorization.

16945649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420814.

The product of its digits is 233280, while the sum is 44.

The square root of 16945649 is about 4116.5093222292. The cubic root of 16945649 is about 256.8538435265.

The spelling of 16945649 in words is "sixteen million, nine hundred forty-five thousand, six hundred forty-nine".