161331742 has 16 divisors (see below), whose sum is σ = 284305392. Its totient is φ = 67691520.

The previous prime is 161331739. The next prime is 161331749. The reversal of 161331742 is 247133161.

It is a self number, because there is not a number n which added to its sum of digits gives 161331742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161331749) 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, 281763 + ... + 282334.

It is an arithmetic number, because the mean of its divisors is an integer number (17769087).

Almost surely, 2^161331742 is an apocalyptic number.

161331742 is a deficient number, since it is larger than the sum of its proper divisors (122973650).

161331742 is a wasteful number, since it uses less digits than its factorization.

161331742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564123.

The product of its digits is 3024, while the sum is 28.

The square root of 161331742 is about 12701.6432795131. The cubic root of 161331742 is about 544.3855735904.

The spelling of 161331742 in words is "one hundred sixty-one million, three hundred thirty-one thousand, seven hundred forty-two".