449121993 has 4 divisors (see below), whose sum is σ = 598829328. Its totient is φ = 299414660.

The previous prime is 449121977. The next prime is 449122027. The reversal of 449121993 is 399121944.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 449121993 - 2⁴ = 449121977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (449121923) 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, 74853663 + ... + 74853668.

It is an arithmetic number, because the mean of its divisors is an integer number (149707332).

Almost surely, 2^449121993 is an apocalyptic number.

It is an amenable number.

449121993 is a deficient number, since it is larger than the sum of its proper divisors (149707335).

449121993 is a wasteful number, since it uses less digits than its factorization.

449121993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149707334.

The product of its digits is 69984, while the sum is 42.

The square root of 449121993 is about 21192.4985077267. The cubic root of 449121993 is about 765.8107189789.

The spelling of 449121993 in words is "four hundred forty-nine million, one hundred twenty-one thousand, nine hundred ninety-three".