245621 has 2 divisors, whose sum is σ = 245622. Its totient is φ = 245620.
The previous prime is 245593. The next prime is 245627. The reversal of 245621 is 126542.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 192721 + 52900 = 439^2 + 230^2 .
It is a cyclic number.
It is not a de Polignac number, because 245621 - 210 = 244597 is a prime.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 245593 and 245602.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (245627) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122810 + 122811.
It is an arithmetic number, because the mean of its divisors is an integer number (122811).
2245621 is an apocalyptic number.
It is an amenable number.
245621 is a deficient number, since it is larger than the sum of its proper divisors (1).
245621 is an equidigital number, since it uses as much as digits as its factorization.
245621 is an evil number, because the sum of its binary digits is even.
The product of its digits is 480, while the sum is 20.
The square root of 245621 is about 495.6016545574. The cubic root of 245621 is about 62.6260708606.
The spelling of 245621 in words is "two hundred forty-five thousand, six hundred twenty-one".
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