449451381 has 4 divisors (see below), whose sum is σ = 599268512. Its totient is φ = 299634252.

The previous prime is 449451319. The next prime is 449451419. The reversal of 449451381 is 183154944.

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 de Polignac number, because none of the positive numbers 2^k-449451381 is a prime.

It is a super-2 number, since 2×449451381² = 404013087765614322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (449441381) 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, 74908561 + ... + 74908566.

It is an arithmetic number, because the mean of its divisors is an integer number (149817128).

Almost surely, 2^449451381 is an apocalyptic number.

It is an amenable number.

449451381 is a deficient number, since it is larger than the sum of its proper divisors (149817131).

449451381 is a wasteful number, since it uses less digits than its factorization.

449451381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149817130.

The product of its digits is 69120, while the sum is 39.

The square root of 449451381 is about 21200.2684181121. The cubic root of 449451381 is about 765.9978895201.

The spelling of 449451381 in words is "four hundred forty-nine million, four hundred fifty-one thousand, three hundred eighty-one".