245274809 has 8 divisors (see below), whose sum is σ = 264264840. Its totient is φ = 226302336.

The previous prime is 245274797. The next prime is 245274823. The reversal of 245274809 is 908472542.

It can be written as a sum of positive squares in 4 ways, for example, as 21114025 + 224160784 = 4595^2 + 14972^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-245274809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245274409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46877 + ... + 51845.

It is an arithmetic number, because the mean of its divisors is an integer number (33033105).

Almost surely, 2^245274809 is an apocalyptic number.

It is an amenable number.

245274809 is a deficient number, since it is larger than the sum of its proper divisors (18990031).

245274809 is a wasteful number, since it uses less digits than its factorization.

245274809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8779.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 245274809 is about 15661.2518337456. The cubic root of 245274809 is about 625.9663421359.

The spelling of 245274809 in words is "two hundred forty-five million, two hundred seventy-four thousand, eight hundred nine".