16191949 has 4 divisors (see below), whose sum is σ = 16209280. Its totient is φ = 16174620.

The previous prime is 16191941. The next prime is 16191961. The reversal of 16191949 is 94919161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94919161 = 809 ⋅117329.

It is a cyclic number.

It is not a de Polignac number, because 16191949 - 2³ = 16191941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16191941) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7179 + ... + 9160.

It is an arithmetic number, because the mean of its divisors is an integer number (4052320).

Almost surely, 2^16191949 is an apocalyptic number.

It is an amenable number.

16191949 is a deficient number, since it is larger than the sum of its proper divisors (17331).

16191949 is an equidigital number, since it uses as much as digits as its factorization.

16191949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17330.

The product of its digits is 17496, while the sum is 40.

The square root of 16191949 is about 4023.9220916911. The cubic root of 16191949 is about 252.9878761239.

The spelling of 16191949 in words is "sixteen million, one hundred ninety-one thousand, nine hundred forty-nine".