248265821 has 2 divisors, whose sum is σ = 248265822. Its totient is φ = 248265820.

The previous prime is 248265793. The next prime is 248265847. The reversal of 248265821 is 128562842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248220025 + 45796 = 15755^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 248265821 - 2⁶ = 248265757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248265851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124132910 + 124132911.

It is an arithmetic number, because the mean of its divisors is an integer number (124132911).

Almost surely, 2^248265821 is an apocalyptic number.

It is an amenable number.

248265821 is a deficient number, since it is larger than the sum of its proper divisors (1).

248265821 is an equidigital number, since it uses as much as digits as its factorization.

248265821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 38.

The square root of 248265821 is about 15756.4533128493. The cubic root of 248265821 is about 628.5005247723.

The spelling of 248265821 in words is "two hundred forty-eight million, two hundred sixty-five thousand, eight hundred twenty-one".