248587981 has 2 divisors, whose sum is σ = 248587982. Its totient is φ = 248587980.

The previous prime is 248587949. The next prime is 248587987. The reversal of 248587981 is 189785842.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140635881 + 107952100 = 11859^2 + 10390^2 .

It is a cyclic number.

It is not a de Polignac number, because 248587981 - 2⁵ = 248587949 is a prime.

It is a super-2 number, since 2×248587981² = 123591968595312722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248587987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124293990 + 124293991.

It is an arithmetic number, because the mean of its divisors is an integer number (124293991).

Almost surely, 2^248587981 is an apocalyptic number.

It is an amenable number.

248587981 is a deficient number, since it is larger than the sum of its proper divisors (1).

248587981 is an equidigital number, since it uses as much as digits as its factorization.

248587981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 52.

The square root of 248587981 is about 15766.6731113447. The cubic root of 248587981 is about 628.7722633604.

The spelling of 248587981 in words is "two hundred forty-eight million, five hundred eighty-seven thousand, nine hundred eighty-one".