161201042 has 4 divisors (see below), whose sum is σ = 241801566. Its totient is φ = 80600520.

The previous prime is 161201041. The next prime is 161201059. The reversal of 161201042 is 240102161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 157276681 + 3924361 = 12541^2 + 1981^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161201042.

It is not an unprimeable number, because it can be changed into a prime (161201041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40300259 + ... + 40300262.

Almost surely, 2^161201042 is an apocalyptic number.

161201042 is a deficient number, since it is larger than the sum of its proper divisors (80600524).

161201042 is an equidigital number, since it uses as much as digits as its factorization.

161201042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80600523.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 161201042 is about 12696.4972334892. The cubic root of 161201042 is about 544.2385258237.

The spelling of 161201042 in words is "one hundred sixty-one million, two hundred one thousand, forty-two".