161797536 has 36 divisors (see below), whose sum is σ = 460112562. Its totient is φ = 53932416.

The previous prime is 161797507. The next prime is 161797553. The reversal of 161797536 is 635797161.

161797536 is a `hidden beast` number, since 16 + 17 + 97 + 536 = 666.

It can be written as a sum of positive squares in only one way, i.e., 145443600 + 16353936 = 12060^2 + 4044^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 161797491 and 161797500.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 280611 + ... + 281186.

Almost surely, 2^161797536 is an apocalyptic number.

161797536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161797536 is an abundant number, since it is smaller than the sum of its proper divisors (298315026).

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

161797536 is a wasteful number, since it uses less digits than its factorization.

161797536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561813 (or 561802 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 161797536 is about 12719.9660376905. The cubic root of 161797536 is about 544.9089834822.

The spelling of 161797536 in words is "one hundred sixty-one million, seven hundred ninety-seven thousand, five hundred thirty-six".