449112781 has 4 divisors (see below), whose sum is σ = 483659932. Its totient is φ = 414565632.

The previous prime is 449112721. The next prime is 449112791. The reversal of 449112781 is 187211944.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189612900 + 259499881 = 13770^2 + 16109^2 .

It is a de Polignac number, because none of the positive numbers 2^k-449112781 is a prime.

It is a super-2 number, since 2×449112781² = 403404580115107922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 449112781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (449112721) 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, 17273556 + ... + 17273581.

It is an arithmetic number, because the mean of its divisors is an integer number (120914983).

Almost surely, 2^449112781 is an apocalyptic number.

It is an amenable number.

449112781 is a deficient number, since it is larger than the sum of its proper divisors (34547151).

449112781 is a wasteful number, since it uses less digits than its factorization.

449112781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34547150.

The product of its digits is 16128, while the sum is 37.

The square root of 449112781 is about 21192.2811655565. The cubic root of 449112781 is about 765.8054830618.

The spelling of 449112781 in words is "four hundred forty-nine million, one hundred twelve thousand, seven hundred eighty-one".