1601650549 has 2 divisors, whose sum is σ = 1601650550. Its totient is φ = 1601650548.

The previous prime is 1601650511. The next prime is 1601650577. The reversal of 1601650549 is 9450561061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1321322500 + 280328049 = 36350^2 + 16743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601650549 - 2²⁹ = 1064779637 is a prime.

It is a super-2 number, since 2×1601650549² = 5130568962224002802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601650249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800825274 + 800825275.

It is an arithmetic number, because the mean of its divisors is an integer number (800825275).

Almost surely, 2^1601650549 is an apocalyptic number.

It is an amenable number.

1601650549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601650549 is an equidigital number, since it uses as much as digits as its factorization.

1601650549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1601650549 is about 40020.6265443209. The cubic root of 1601650549 is about 1170.0091432797.

The spelling of 1601650549 in words is "one billion, six hundred one million, six hundred fifty thousand, five hundred forty-nine".