161634005 has 8 divisors (see below), whose sum is σ = 208880952. Its totient is φ = 119360448.

The previous prime is 161633971. The next prime is 161634017. The reversal of 161634005 is 500436161.

161634005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8814961 + 152819044 = 2969^2 + 12362^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 161634005 - 2²⁰ = 160585429 is a prime.

It is a super-2 number, since 2×161634005² = 52251103144680050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1243274 + ... + 1243403.

It is an arithmetic number, because the mean of its divisors is an integer number (26110119).

Almost surely, 2^161634005 is an apocalyptic number.

It is an amenable number.

161634005 is a deficient number, since it is larger than the sum of its proper divisors (47246947).

161634005 is a wasteful number, since it uses less digits than its factorization.

161634005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486695.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 161634005 is about 12713.5362901122. The cubic root of 161634005 is about 544.7253392573.

The spelling of 161634005 in words is "one hundred sixty-one million, six hundred thirty-four thousand, five".