161130905 has 8 divisors (see below), whose sum is σ = 208230792. Its totient is φ = 118988928.

The previous prime is 161130889. The next prime is 161130919. The reversal of 161130905 is 509031161.

161130905 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 2849344 + 158281561 = 1688^2 + 12581^2 .

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 161130905 - 2⁴ = 161130889 is a prime.

It is a super-2 number, since 2×161130905² = 51926337092238050, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 16.

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, 1239404 + ... + 1239533.

It is an arithmetic number, because the mean of its divisors is an integer number (26028849).

Almost surely, 2^161130905 is an apocalyptic number.

It is an amenable number.

161130905 is a deficient number, since it is larger than the sum of its proper divisors (47099887).

161130905 is a wasteful number, since it uses less digits than its factorization.

161130905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478955.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 161130905 is about 12693.7348719752. The cubic root of 161130905 is about 544.1595834167.

The spelling of 161130905 in words is "one hundred sixty-one million, one hundred thirty thousand, nine hundred five".