248520991 has 2 divisors, whose sum is σ = 248520992. Its totient is φ = 248520990.

The previous prime is 248520989. The next prime is 248520997. The reversal of 248520991 is 199025842.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 248520991 - 2¹ = 248520989 is a prime.

Together with 248520989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248520997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124260495 + 124260496.

It is an arithmetic number, because the mean of its divisors is an integer number (124260496).

Almost surely, 2^248520991 is an apocalyptic number.

248520991 is a deficient number, since it is larger than the sum of its proper divisors (1).

248520991 is an equidigital number, since it uses as much as digits as its factorization.

248520991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 248520991 is about 15764.5485504660. The cubic root of 248520991 is about 628.7157773388.

The spelling of 248520991 in words is "two hundred forty-eight million, five hundred twenty thousand, nine hundred ninety-one".