22501 has 2 divisors, whose sum is σ = 22502.
Its totient is φ = 22500.
The previous prime is 22483. The next prime is 22511. The reversal of 22501 is 10522.
It is a Cunningham number, because it is equal to 1502+1.
It is an a-pointer prime, because the next prime (22511) can be obtained adding 22501 to its sum of digits (10).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 22500 + 1 = 150^2 + 1^2
It is a cyclic number.
It is not a de Polignac number, because 22501 - 25 = 22469 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (22511) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11250 + 11251.
It is an arithmetic number, because the mean of its divisors is an integer number (11251).
222501 is an apocalyptic number.
It is an amenable number.
22501 is a deficient number, since it is larger than the sum of its proper divisors (1).
22501 is an equidigital number, since it uses as much as digits as its factorization.
22501 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 20, while the sum is 10.
The square root of 22501 is about 150.0033332963.
The cubic root of 22501 is about 28.2314990985.
The spelling of 22501 in words is "twenty-two thousand, five hundred one".