161861044 has 24 divisors (see below), whose sum is σ = 298626048. Its totient is φ = 76650720.

The previous prime is 161861041. The next prime is 161861047. The reversal of 161861044 is 440168161.

It is an interprime number because it is at equal distance from previous prime (161861041) and next prime (161861047).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 161860997 and 161861015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161861041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8059 + ... + 19714.

It is an arithmetic number, because the mean of its divisors is an integer number (12442752).

Almost surely, 2^161861044 is an apocalyptic number.

It is an amenable number.

161861044 is a deficient number, since it is larger than the sum of its proper divisors (136765004).

161861044 is a wasteful number, since it uses less digits than its factorization.

161861044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27855 (or 27853 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 161861044 is about 12722.4621830839. The cubic root of 161861044 is about 544.9802691844.

The spelling of 161861044 in words is "one hundred sixty-one million, eight hundred sixty-one thousand, forty-four".