425549999 has 4 divisors (see below), whose sum is σ = 486342864. Its totient is φ = 364757136.

The previous prime is 425549953. The next prime is 425550017. The reversal of 425549999 is 999945524.

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 425549999 - 2²⁰ = 424501423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425549699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30396422 + ... + 30396435.

It is an arithmetic number, because the mean of its divisors is an integer number (121585716).

Almost surely, 2^425549999 is an apocalyptic number.

425549999 is a deficient number, since it is larger than the sum of its proper divisors (60792865).

425549999 is an equidigital number, since it uses as much as digits as its factorization.

425549999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60792864.

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

The square root of 425549999 is about 20628.8632503102. The cubic root of 425549999 is about 752.1714839938.

The spelling of 425549999 in words is "four hundred twenty-five million, five hundred forty-nine thousand, nine hundred ninety-nine".