245245405 has 4 divisors (see below), whose sum is σ = 294294492. Its totient is φ = 196196320.

The previous prime is 245245397. The next prime is 245245409. The reversal of 245245405 is 504542542.

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 167417721 + 77827684 = 12939^2 + 8822^2 .

It is not a de Polignac number, because 245245405 - 2³ = 245245397 is a prime.

It is a super-2 number, since 2×245245405² = 120290617347228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245245409) 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, 24524536 + ... + 24524545.

It is an arithmetic number, because the mean of its divisors is an integer number (73573623).

Almost surely, 2^245245405 is an apocalyptic number.

It is an amenable number.

245245405 is a deficient number, since it is larger than the sum of its proper divisors (49049087).

245245405 is an equidigital number, since it uses as much as digits as its factorization.

245245405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49049086.

The product of its (nonzero) digits is 32000, while the sum is 31.

The square root of 245245405 is about 15660.3130556193. The cubic root of 245245405 is about 625.9413271334.

Adding to 245245405 its reverse (504542542), we get a palindrome (749787947).

It can be divided in two parts, 24524 and 5405, that added together give a square (29929 = 173²).

The spelling of 245245405 in words is "two hundred forty-five million, two hundred forty-five thousand, four hundred five".