23287081 has 4 divisors (see below), whose sum is σ = 23527252. Its totient is φ = 23046912.

The previous prime is 23287079. The next prime is 23287111. The reversal of 23287081 is 18078232.

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 14784025 + 8503056 = 3845^2 + 2916^2 .

It is a cyclic number.

It is not a de Polignac number, because 23287081 - 2¹ = 23287079 is a prime.

It is a super-2 number, since 2×23287081² = 1084576283001122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23287031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119940 + ... + 120133.

It is an arithmetic number, because the mean of its divisors is an integer number (5881813).

Almost surely, 2^23287081 is an apocalyptic number.

It is an amenable number.

23287081 is a deficient number, since it is larger than the sum of its proper divisors (240171).

23287081 is an equidigital number, since it uses as much as digits as its factorization.

23287081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240170.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 23287081 is about 4825.6689691689. The cubic root of 23287081 is about 285.5650265991.

It can be divided in two parts, 2328 and 7081, that added together give a square (9409 = 97²).

The spelling of 23287081 in words is "twenty-three million, two hundred eighty-seven thousand, eighty-one".