248921643 has 6 divisors (see below), whose sum is σ = 331931964. Its totient is φ = 165929544.

The previous prime is 248921639. The next prime is 248921657. The reversal of 248921643 is 346129842.

It is not a de Polignac number, because 248921643 - 2² = 248921639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (248921623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22773 + ... + 31881.

It is an arithmetic number, because the mean of its divisors is an integer number (55321994).

Almost surely, 2^248921643 is an apocalyptic number.

248921643 is a deficient number, since it is larger than the sum of its proper divisors (83010321).

248921643 is an frugal number, since it uses more digits than its factorization.

248921643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18221 (or 9112 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 248921643 is about 15777.2508061449. The cubic root of 248921643 is about 629.0534563806.

The spelling of 248921643 in words is "two hundred forty-eight million, nine hundred twenty-one thousand, six hundred forty-three".