161601535 has 8 divisors (see below), whose sum is σ = 194162976. Its totient is φ = 129120480.

The previous prime is 161601511. The next prime is 161601599. The reversal of 161601535 is 535106161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161601535 - 2²¹ = 159504383 is a prime.

It is a super-2 number, since 2×161601535² = 52230112228712450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15579 + ... + 23788.

It is an arithmetic number, because the mean of its divisors is an integer number (24270372).

Almost surely, 2^161601535 is an apocalyptic number.

161601535 is a deficient number, since it is larger than the sum of its proper divisors (32561441).

161601535 is an equidigital number, since it uses as much as digits as its factorization.

161601535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40193.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 161601535 is about 12712.2592405913. The cubic root of 161601535 is about 544.6888609262.

Adding to 161601535 its reverse (535106161), we get a palindrome (696707696).

The spelling of 161601535 in words is "one hundred sixty-one million, six hundred one thousand, five hundred thirty-five".