161435601 has 6 divisors (see below), whose sum is σ = 233184770. Its totient is φ = 107623728.

The previous prime is 161435591. The next prime is 161435633. The reversal of 161435601 is 106534161.

161435601 is a `hidden beast` number, since 1 + 61 + 43 + 560 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 145443600 + 15992001 = 12060^2 + 3999^2 .

It is not a de Polignac number, because 161435601 - 2¹⁸ = 161173457 is a prime.

It is a super-2 number, since 2×161435601² = 52122906540462402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161435641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8968636 + ... + 8968653.

Almost surely, 2^161435601 is an apocalyptic number.

It is an amenable number.

161435601 is a deficient number, since it is larger than the sum of its proper divisors (71749169).

161435601 is a wasteful number, since it uses less digits than its factorization.

161435601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17937295 (or 17937292 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 161435601 is about 12705.7310297361. The cubic root of 161435601 is about 544.5023665049.

Adding to 161435601 its reverse (106534161), we get a palindrome (267969762).

The spelling of 161435601 in words is "one hundred sixty-one million, four hundred thirty-five thousand, six hundred one".