248812409 has 4 divisors (see below), whose sum is σ = 249218916. Its totient is φ = 248405904.

The previous prime is 248812387. The next prime is 248812427. The reversal of 248812409 is 904218842.

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 11560000 + 237252409 = 3400^2 + 15403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248812409 is a prime.

It is a super-2 number, since 2×248812409² = 123815229744766562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (248812439) 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, 202334 + ... + 203559.

It is an arithmetic number, because the mean of its divisors is an integer number (62304729).

Almost surely, 2^248812409 is an apocalyptic number.

It is an amenable number.

248812409 is a deficient number, since it is larger than the sum of its proper divisors (406507).

248812409 is an equidigital number, since it uses as much as digits as its factorization.

248812409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406506.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 248812409 is about 15773.7886698155. The cubic root of 248812409 is about 628.9614273146.

The spelling of 248812409 in words is "two hundred forty-eight million, eight hundred twelve thousand, four hundred nine".