245401565 has 4 divisors (see below), whose sum is σ = 294481884. Its totient is φ = 196321248.

The previous prime is 245401493. The next prime is 245401573. The reversal of 245401565 is 565104542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565104542 = 2 ⋅282552271.

It can be written as a sum of positive squares in 2 ways, for example, as 181225444 + 64176121 = 13462^2 + 8011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245401565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24540152 + ... + 24540161.

It is an arithmetic number, because the mean of its divisors is an integer number (73620471).

Almost surely, 2^245401565 is an apocalyptic number.

It is an amenable number.

245401565 is a deficient number, since it is larger than the sum of its proper divisors (49080319).

245401565 is an equidigital number, since it uses as much as digits as its factorization.

245401565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49080318.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 245401565 is about 15665.2981139843. The cubic root of 245401565 is about 626.0741549815.

The spelling of 245401565 in words is "two hundred forty-five million, four hundred one thousand, five hundred sixty-five".