245549999 has 4 divisors (see below), whose sum is σ = 245609664. Its totient is φ = 245490336.

The previous prime is 245549981. The next prime is 245550031. The reversal of 245549999 is 999945542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245549999 - 2⁸ = 245549743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245549399) 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, 23162 + ... + 32055.

It is an arithmetic number, because the mean of its divisors is an integer number (61402416).

Almost surely, 2^245549999 is an apocalyptic number.

245549999 is a deficient number, since it is larger than the sum of its proper divisors (59665).

245549999 is an equidigital number, since it uses as much as digits as its factorization.

245549999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59664.

The product of its digits is 5248800, while the sum is 56.

The square root of 245549999 is about 15670.0350669678. The cubic root of 245549999 is about 626.2003589588.

The spelling of 245549999 in words is "two hundred forty-five million, five hundred forty-nine thousand, nine hundred ninety-nine".