23281091 has 2 divisors, whose sum is σ = 23281092. Its totient is φ = 23281090.

The previous prime is 23281073. The next prime is 23281117. The reversal of 23281091 is 19018232.

It is an a-pointer prime, because the next prime (23281117) can be obtained adding 23281091 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23281091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23281091.

It is not a weakly prime, because it can be changed into another prime (23221091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11640545 + 11640546.

It is an arithmetic number, because the mean of its divisors is an integer number (11640546).

Almost surely, 2^23281091 is an apocalyptic number.

23281091 is a deficient number, since it is larger than the sum of its proper divisors (1).

23281091 is an equidigital number, since it uses as much as digits as its factorization.

23281091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 23281091 is about 4825.0482899138. The cubic root of 23281091 is about 285.5405397575.

The spelling of 23281091 in words is "twenty-three million, two hundred eighty-one thousand, ninety-one".