245805539 has 12 divisors (see below), whose sum is σ = 285631632. Its totient is φ = 207214560.

The previous prime is 245805529. The next prime is 245805551. The reversal of 245805539 is 935508542.

245805539 = 50² + 51² + ... + 903².

It is not a de Polignac number, because 245805539 - 2⁴ = 245805523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245805496 and 245805505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245805509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21329 + ... + 30765.

It is an arithmetic number, because the mean of its divisors is an integer number (23802636).

Almost surely, 2^245805539 is an apocalyptic number.

245805539 is a deficient number, since it is larger than the sum of its proper divisors (39826093).

245805539 is an frugal number, since it uses more digits than its factorization.

245805539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9566 (or 9505 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 245805539 is about 15678.1867255113. The cubic root of 245805539 is about 626.4175092509.

The spelling of 245805539 in words is "two hundred forty-five million, eight hundred five thousand, five hundred thirty-nine".