245640361 has 4 divisors (see below), whose sum is σ = 260089812. Its totient is φ = 231190912.

The previous prime is 245640347. The next prime is 245640407. The reversal of 245640361 is 163046542.

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 220077225 + 25563136 = 14835^2 + 5056^2 .

It is a cyclic number.

It is not a de Polignac number, because 245640361 - 2⁷ = 245640233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245647361) 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, 7224700 + ... + 7224733.

It is an arithmetic number, because the mean of its divisors is an integer number (65022453).

Almost surely, 2^245640361 is an apocalyptic number.

It is an amenable number.

245640361 is a deficient number, since it is larger than the sum of its proper divisors (14449451).

245640361 is a wasteful number, since it uses less digits than its factorization.

245640361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14449450.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 245640361 is about 15672.9180754574. The cubic root of 245640361 is about 626.2771631093.

The spelling of 245640361 in words is "two hundred forty-five million, six hundred forty thousand, three hundred sixty-one".