161240602 has 4 divisors (see below), whose sum is σ = 241860906. Its totient is φ = 80620300.

The previous prime is 161240549. The next prime is 161240621. The reversal of 161240602 is 206042161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 206042161 = 13 ⋅15849397.

It can be written as a sum of positive squares in only one way, i.e., 107350321 + 53890281 = 10361^2 + 7341^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 40310149 + ... + 40310152.

Almost surely, 2^161240602 is an apocalyptic number.

161240602 is a deficient number, since it is larger than the sum of its proper divisors (80620304).

161240602 is an equidigital number, since it uses as much as digits as its factorization.

161240602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80620303.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 161240602 is about 12698.0550479197. The cubic root of 161240602 is about 544.2830423166.

Adding to 161240602 its reverse (206042161), we get a palindrome (367282763).

The spelling of 161240602 in words is "one hundred sixty-one million, two hundred forty thousand, six hundred two".