17720149 has 2 divisors, whose sum is σ = 17720150. Its totient is φ = 17720148.

The previous prime is 17720107. The next prime is 17720161. The reversal of 17720149 is 94102771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16056049 + 1664100 = 4007^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 17720149 - 2¹³ = 17711957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17720149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17720449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8860074 + 8860075.

It is an arithmetic number, because the mean of its divisors is an integer number (8860075).

Almost surely, 2^17720149 is an apocalyptic number.

It is an amenable number.

17720149 is a deficient number, since it is larger than the sum of its proper divisors (1).

17720149 is an equidigital number, since it uses as much as digits as its factorization.

17720149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 17720149 is about 4209.5307339417. The cubic root of 17720149 is about 260.7088595069.

The spelling of 17720149 in words is "seventeen million, seven hundred twenty thousand, one hundred forty-nine".