23405161 has 4 divisors (see below), whose sum is σ = 25205572. Its totient is φ = 21604752.

The previous prime is 23405153. The next prime is 23405183. The reversal of 23405161 is 16150432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15452761 + 7952400 = 3931^2 + 2820^2 .

It is not a de Polignac number, because 23405161 - 2³ = 23405153 is a prime.

It is a super-2 number, since 2×23405161² = 1095603122871842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23405101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900186 + ... + 900211.

It is an arithmetic number, because the mean of its divisors is an integer number (6301393).

Almost surely, 2^23405161 is an apocalyptic number.

It is an amenable number.

23405161 is a deficient number, since it is larger than the sum of its proper divisors (1800411).

23405161 is a wasteful number, since it uses less digits than its factorization.

23405161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800410.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 23405161 is about 4837.8880722894. Note that the first 3 decimals coincide. The cubic root of 23405161 is about 286.0468772493.

Adding to 23405161 its reverse (16150432), we get a palindrome (39555593).

The spelling of 23405161 in words is "twenty-three million, four hundred five thousand, one hundred sixty-one".