248401309 has 4 divisors (see below), whose sum is σ = 267509116. Its totient is φ = 229293504.

The previous prime is 248401303. The next prime is 248401339. The reversal of 248401309 is 903104842.

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 94517284 + 153884025 = 9722^2 + 12405^2 .

It is a cyclic number.

It is not a de Polignac number, because 248401309 - 2²⁷ = 114183581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248401303) 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 3 ways as a sum of consecutive naturals, for example, 9553884 + ... + 9553909.

It is an arithmetic number, because the mean of its divisors is an integer number (66877279).

Almost surely, 2^248401309 is an apocalyptic number.

It is an amenable number.

248401309 is a deficient number, since it is larger than the sum of its proper divisors (19107807).

248401309 is a wasteful number, since it uses less digits than its factorization.

248401309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19107806.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 248401309 is about 15760.7521711370. The cubic root of 248401309 is about 628.6148361085.

The spelling of 248401309 in words is "two hundred forty-eight million, four hundred one thousand, three hundred nine".