253661 has 2 divisors, whose sum is σ = 253662. Its totient is φ = 253660.
The previous prime is 253651. The next prime is 253679. The reversal of 253661 is 166352.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 220900 + 32761 = 470^2 + 181^2 .
It is a cyclic number.
It is not a de Polignac number, because 253661 - 214 = 237277 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (253601) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126830 + 126831.
It is an arithmetic number, because the mean of its divisors is an integer number (126831).
2253661 is an apocalyptic number.
It is an amenable number.
253661 is a deficient number, since it is larger than the sum of its proper divisors (1).
253661 is an equidigital number, since it uses as much as digits as its factorization.
253661 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1080, while the sum is 23.
The square root of 253661 is about 503.6476943261. The cubic root of 253661 is about 63.3020682863.
The spelling of 253661 in words is "two hundred fifty-three thousand, six hundred sixty-one".
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