248713921 has 4 divisors (see below), whose sum is σ = 248785344. Its totient is φ = 248642500.

The previous prime is 248713909. The next prime is 248713967. The reversal of 248713921 is 129317842.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129317842 = 2 ⋅64658921.

It is a cyclic number.

It is not a de Polignac number, because 248713921 - 2¹¹ = 248711873 is a prime.

It is a super-2 number, since 2×248713921² = 123717228998388482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (248713991) 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 in 3 ways as a sum of consecutive naturals, for example, 30205 + ... + 37546.

It is an arithmetic number, because the mean of its divisors is an integer number (62196336).

Almost surely, 2^248713921 is an apocalyptic number.

It is an amenable number.

248713921 is a deficient number, since it is larger than the sum of its proper divisors (71423).

248713921 is an equidigital number, since it uses as much as digits as its factorization.

248713921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71422.

The product of its digits is 24192, while the sum is 37.

The square root of 248713921 is about 15770.6664729174. Note that the first 3 decimals coincide. The cubic root of 248713921 is about 628.8784286029.

The spelling of 248713921 in words is "two hundred forty-eight million, seven hundred thirteen thousand, nine hundred twenty-one".