161520536 has 32 divisors (see below), whose sum is σ = 334614240. Its totient is φ = 72703488.

The previous prime is 161520533. The next prime is 161520547. The reversal of 161520536 is 635025161.

It is a junction number, because it is equal to n+sod(n) for n = 161520499 and 161520508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161520533) 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, 22691 + ... + 28946.

It is an arithmetic number, because the mean of its divisors is an integer number (10456695).

Almost surely, 2^161520536 is an apocalyptic number.

It is an amenable number.

161520536 is an abundant number, since it is smaller than the sum of its proper divisors (173093704).

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

161520536 is a wasteful number, since it uses less digits than its factorization.

161520536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51683 (or 51679 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 161520536 is about 12709.0729795686. The cubic root of 161520536 is about 544.5978415219.

Adding to 161520536 its reverse (635025161), we get a palindrome (796545697).

The spelling of 161520536 in words is "one hundred sixty-one million, five hundred twenty thousand, five hundred thirty-six".