248657813 has 4 divisors (see below), whose sum is σ = 249202380. Its totient is φ = 248113248.

The previous prime is 248657779. The next prime is 248657819. The reversal of 248657813 is 318756842.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121374289 + 127283524 = 11017^2 + 11282^2 .

It is a cyclic number.

It is not a de Polignac number, because 248657813 - 2⁶ = 248657749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248657819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271598 + ... + 272511.

It is an arithmetic number, because the mean of its divisors is an integer number (62300595).

Almost surely, 2^248657813 is an apocalyptic number.

It is an amenable number.

248657813 is a deficient number, since it is larger than the sum of its proper divisors (544567).

248657813 is an equidigital number, since it uses as much as digits as its factorization.

248657813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544566.

The product of its digits is 322560, while the sum is 44.

The square root of 248657813 is about 15768.8875003914. The cubic root of 248657813 is about 628.8311349567.

The spelling of 248657813 in words is "two hundred forty-eight million, six hundred fifty-seven thousand, eight hundred thirteen".