248731781 has 2 divisors, whose sum is σ = 248731782. Its totient is φ = 248731780.

The previous prime is 248731759. The next prime is 248731801. The reversal of 248731781 is 187137842.

248731781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223981156 + 24750625 = 14966^2 + 4975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248731781 is a prime.

It is a super-2 number, since 2×248731781² = 123734997758863922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248731741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124365890 + 124365891.

It is an arithmetic number, because the mean of its divisors is an integer number (124365891).

Almost surely, 2^248731781 is an apocalyptic number.

It is an amenable number.

248731781 is a deficient number, since it is larger than the sum of its proper divisors (1).

248731781 is an equidigital number, since it uses as much as digits as its factorization.

248731781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 41.

The square root of 248731781 is about 15771.2327038821. The cubic root of 248731781 is about 628.8934813723.

The spelling of 248731781 in words is "two hundred forty-eight million, seven hundred thirty-one thousand, seven hundred eighty-one".