161548639 has 12 divisors (see below), whose sum is σ = 188545968. Its totient is φ = 138012000.

The previous prime is 161548633. The next prime is 161548649. The reversal of 161548639 is 936845161.

It is not a de Polignac number, because 161548639 - 2¹⁹ = 161024351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161548595 and 161548604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161548633) 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 11 ways as a sum of consecutive naturals, for example, 9939 + ... + 20539.

It is an arithmetic number, because the mean of its divisors is an integer number (15712164).

Almost surely, 2^161548639 is an apocalyptic number.

161548639 is a deficient number, since it is larger than the sum of its proper divisors (26997329).

161548639 is a wasteful number, since it uses less digits than its factorization.

161548639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10926 (or 10919 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 161548639 is about 12710.1785589346. The cubic root of 161548639 is about 544.6294245969.

The spelling of 161548639 in words is "one hundred sixty-one million, five hundred forty-eight thousand, six hundred thirty-nine".