23281087 has 4 divisors (see below), whose sum is σ = 23600080. Its totient is φ = 22962096.

The previous prime is 23281073. The next prime is 23281091. The reversal of 23281087 is 78018232.

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

It is a cyclic number.

It is not a de Polignac number, because 23281087 - 2¹⁵ = 23248319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23281057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159387 + ... + 159532.

It is an arithmetic number, because the mean of its divisors is an integer number (5900020).

Almost surely, 2^23281087 is an apocalyptic number.

23281087 is a deficient number, since it is larger than the sum of its proper divisors (318993).

23281087 is an equidigital number, since it uses as much as digits as its factorization.

23281087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318992.

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

The square root of 23281087 is about 4825.0478754101. The cubic root of 23281087 is about 285.5405234043.

The spelling of 23281087 in words is "twenty-three million, two hundred eighty-one thousand, eighty-seven".