248265991 has 2 divisors, whose sum is σ = 248265992. Its totient is φ = 248265990.

The previous prime is 248265931. The next prime is 248266003. The reversal of 248265991 is 199562842.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 248265991 - 2²³ = 239877383 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 (248265911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124132995 + 124132996.

It is an arithmetic number, because the mean of its divisors is an integer number (124132996).

Almost surely, 2^248265991 is an apocalyptic number.

248265991 is a deficient number, since it is larger than the sum of its proper divisors (1).

248265991 is an equidigital number, since it uses as much as digits as its factorization.

248265991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The square root of 248265991 is about 15756.4587074634. The cubic root of 248265991 is about 628.5006682275.

The spelling of 248265991 in words is "two hundred forty-eight million, two hundred sixty-five thousand, nine hundred ninety-one".