161541516 has 24 divisors (see below), whose sum is σ = 377198640. Its totient is φ = 53808832.

The previous prime is 161541511. The next prime is 161541547. The reversal of 161541516 is 615145161.

It is a super-2 number, since 2×161541516² = 52191322783156512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161541511) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 16570 + ... + 24446.

It is an arithmetic number, because the mean of its divisors is an integer number (15716610).

Almost surely, 2^161541516 is an apocalyptic number.

It is an amenable number.

161541516 is an abundant number, since it is smaller than the sum of its proper divisors (215657124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161541516 is a wasteful number, since it uses less digits than its factorization.

161541516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9593 (or 9591 counting only the distinct ones).

The product of its digits is 3600, while the sum is 30.

The square root of 161541516 is about 12709.8983473512. The cubic root of 161541516 is about 544.6214198819.

Adding to 161541516 its reverse (615145161), we get a palindrome (776686677).

The spelling of 161541516 in words is "one hundred sixty-one million, five hundred forty-one thousand, five hundred sixteen".