161002549 has 4 divisors (see below), whose sum is σ = 161034336. Its totient is φ = 160970764.

The previous prime is 161002547. The next prime is 161002601. The reversal of 161002549 is 945200161.

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 161002549 - 2¹ = 161002547 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 (161002547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6409 + ... + 19054.

It is an arithmetic number, because the mean of its divisors is an integer number (40258584).

Almost surely, 2^161002549 is an apocalyptic number.

It is an amenable number.

161002549 is a deficient number, since it is larger than the sum of its proper divisors (31787).

161002549 is an equidigital number, since it uses as much as digits as its factorization.

161002549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31786.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161002549 is about 12688.6779847232. The cubic root of 161002549 is about 544.0150535140.

The spelling of 161002549 in words is "one hundred sixty-one million, two thousand, five hundred forty-nine".