248520989 has 2 divisors, whose sum is σ = 248520990. Its totient is φ = 248520988.

The previous prime is 248520929. The next prime is 248520991. The reversal of 248520989 is 989025842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238548025 + 9972964 = 15445^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 248520989 - 2⁸ = 248520733 is a prime.

Together with 248520991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248520919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124260494 + 124260495.

It is an arithmetic number, because the mean of its divisors is an integer number (124260495).

Almost surely, 2^248520989 is an apocalyptic number.

It is an amenable number.

248520989 is a deficient number, since it is larger than the sum of its proper divisors (1).

248520989 is an equidigital number, since it uses as much as digits as its factorization.

248520989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 248520989 is about 15764.5484870325. The cubic root of 248520989 is about 628.7157756523.

The spelling of 248520989 in words is "two hundred forty-eight million, five hundred twenty thousand, nine hundred eighty-nine".