161881742 has 16 divisors (see below), whose sum is σ = 265213872. Its totient is φ = 73494720.

The previous prime is 161881717. The next prime is 161881747. The reversal of 161881742 is 247188161.

It is a happy number.

161881742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161881696 and 161881705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161881747) 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, 16688 + ... + 24540.

It is an arithmetic number, because the mean of its divisors is an integer number (16575867).

Almost surely, 2^161881742 is an apocalyptic number.

161881742 is a deficient number, since it is larger than the sum of its proper divisors (103332130).

161881742 is a wasteful number, since it uses less digits than its factorization.

161881742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8803.

The product of its digits is 21504, while the sum is 38.

The square root of 161881742 is about 12723.2756002533. The cubic root of 161881742 is about 545.0034979996.

The spelling of 161881742 in words is "one hundred sixty-one million, eight hundred eighty-one thousand, seven hundred forty-two".