245005645 has 4 divisors (see below), whose sum is σ = 294006780. Its totient is φ = 196004512.

The previous prime is 245005643. The next prime is 245005723. The reversal of 245005645 is 546500542.

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 110376036 + 134629609 = 10506^2 + 11603^2 .

It is a cyclic number.

It is not a de Polignac number, because 245005645 - 2¹ = 245005643 is a prime.

It is a super-3 number, since 3×245005645³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245005643) 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, 24500560 + ... + 24500569.

It is an arithmetic number, because the mean of its divisors is an integer number (73501695).

Almost surely, 2^245005645 is an apocalyptic number.

It is an amenable number.

245005645 is a deficient number, since it is larger than the sum of its proper divisors (49001135).

245005645 is an equidigital number, since it uses as much as digits as its factorization.

245005645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49001134.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 245005645 is about 15652.6561643703. The cubic root of 245005645 is about 625.7372803264.

The spelling of 245005645 in words is "two hundred forty-five million, five thousand, six hundred forty-five".