16749949 has 2 divisors, whose sum is σ = 16749950. Its totient is φ = 16749948.

The previous prime is 16749899. The next prime is 16749979. The reversal of 16749949 is 94994761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 5257849 = 3390^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 16749949 - 2²¹ = 14652797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16749979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8374974 + 8374975.

It is an arithmetic number, because the mean of its divisors is an integer number (8374975).

Almost surely, 2^16749949 is an apocalyptic number.

It is an amenable number.

16749949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16749949 is an equidigital number, since it uses as much as digits as its factorization.

16749949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 16749949 is about 4092.6701552898. The cubic root of 16749949 is about 255.8612376650.

The spelling of 16749949 in words is "sixteen million, seven hundred forty-nine thousand, nine hundred forty-nine".