161601807 has 8 divisors (see below), whose sum is σ = 215552176. Its totient is φ = 107692992.

The previous prime is 161601761. The next prime is 161601809. The reversal of 161601807 is 708106161.

It is a happy number.

161601807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 161601807 - 2⁶ = 161601743 is a prime.

It is a super-2 number, since 2×161601807² = 52230288051330498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161601809) 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, 243 + ... + 17979.

It is an arithmetic number, because the mean of its divisors is an integer number (26944022).

Almost surely, 2^161601807 is an apocalyptic number.

161601807 is a deficient number, since it is larger than the sum of its proper divisors (53950369).

161601807 is a wasteful number, since it uses less digits than its factorization.

161601807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20777.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 161601807 is about 12712.2699389212. The cubic root of 161601807 is about 544.6891665241.

Adding to 161601807 its reverse (708106161), we get a palindrome (869707968).

The spelling of 161601807 in words is "one hundred sixty-one million, six hundred one thousand, eight hundred seven".