161042516 has 6 divisors (see below), whose sum is σ = 281824410. Its totient is φ = 80521256.

The previous prime is 161042509. The next prime is 161042561. The reversal of 161042516 is 615240161.

It can be written as a sum of positive squares in only one way, i.e., 116553616 + 44488900 = 10796^2 + 6670^2 .

It is a super-2 number, since 2×161042516² = 51869383919220512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20130311 + ... + 20130318.

It is an arithmetic number, because the mean of its divisors is an integer number (46970735).

Almost surely, 2^161042516 is an apocalyptic number.

It is an amenable number.

161042516 is a deficient number, since it is larger than the sum of its proper divisors (120781894).

161042516 is a wasteful number, since it uses less digits than its factorization.

161042516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40260633 (or 40260631 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 161042516 is about 12690.2527949604. The cubic root of 161042516 is about 544.0600649148.

Adding to 161042516 its reverse (615240161), we get a palindrome (776282677).

The spelling of 161042516 in words is "one hundred sixty-one million, forty-two thousand, five hundred sixteen".