23278161 has 4 divisors (see below), whose sum is σ = 31037552. Its totient is φ = 15518772.

The previous prime is 23278159. The next prime is 23278181. The reversal of 23278161 is 16187232.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23278161 - 2¹ = 23278159 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23278141) 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, 3879691 + ... + 3879696.

It is an arithmetic number, because the mean of its divisors is an integer number (7759388).

Almost surely, 2^23278161 is an apocalyptic number.

It is an amenable number.

23278161 is a deficient number, since it is larger than the sum of its proper divisors (7759391).

23278161 is an equidigital number, since it uses as much as digits as its factorization.

23278161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7759390.

The product of its digits is 4032, while the sum is 30.

The square root of 23278161 is about 4824.7446564559. The cubic root of 23278161 is about 285.5285605239.

The spelling of 23278161 in words is "twenty-three million, two hundred seventy-eight thousand, one hundred sixty-one".