245505857 has 8 divisors (see below), whose sum is σ = 261453096. Its totient is φ = 229725952.

The previous prime is 245505787. The next prime is 245505881. The reversal of 245505857 is 758505542.

It can be written as a sum of positive squares in 4 ways, for example, as 180606721 + 64899136 = 13439^2 + 8056^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 245505857 - 2²⁰ = 244457281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245505257) 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 7 ways as a sum of consecutive naturals, for example, 38798 + ... + 44679.

It is an arithmetic number, because the mean of its divisors is an integer number (32681637).

Almost surely, 2^245505857 is an apocalyptic number.

It is an amenable number.

245505857 is a deficient number, since it is larger than the sum of its proper divisors (15947239).

245505857 is a wasteful number, since it uses less digits than its factorization.

245505857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83667.

The product of its (nonzero) digits is 280000, while the sum is 41.

The square root of 245505857 is about 15668.6265192582. The cubic root of 245505857 is about 626.1628331421.

The spelling of 245505857 in words is "two hundred forty-five million, five hundred five thousand, eight hundred fifty-seven".