248135981 has 2 divisors, whose sum is σ = 248135982. Its totient is φ = 248135980.

The previous prime is 248135971. The next prime is 248135999. The reversal of 248135981 is 189531842.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147233956 + 100902025 = 12134^2 + 10045^2 .

It is a cyclic number.

It is not a de Polignac number, because 248135981 - 2⁶ = 248135917 is a prime.

It is a super-2 number, since 2×248135981² = 123142930133664722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248135911) 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, 124067990 + 124067991.

It is an arithmetic number, because the mean of its divisors is an integer number (124067991).

Almost surely, 2^248135981 is an apocalyptic number.

It is an amenable number.

248135981 is a deficient number, since it is larger than the sum of its proper divisors (1).

248135981 is an equidigital number, since it uses as much as digits as its factorization.

248135981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 248135981 is about 15752.3325574342. The cubic root of 248135981 is about 628.3909396269.

The spelling of 248135981 in words is "two hundred forty-eight million, one hundred thirty-five thousand, nine hundred eighty-one".