997281449 has 4 divisors (see below), whose sum is σ = 1040641536. Its totient is φ = 953921364.

The previous prime is 997281419. The next prime is 997281457. The reversal of 997281449 is 944182799.

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 997281449 - 2⁸ = 997281193 is a prime.

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 997281449.

It is not an unprimeable number, because it can be changed into a prime (997281419) 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, 21680009 + ... + 21680054.

It is an arithmetic number, because the mean of its divisors is an integer number (260160384).

Almost surely, 2^997281449 is an apocalyptic number.

It is an amenable number.

997281449 is a deficient number, since it is larger than the sum of its proper divisors (43360087).

997281449 is a wasteful number, since it uses less digits than its factorization.

997281449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43360086.

The product of its digits is 1306368, while the sum is 53.

The square root of 997281449 is about 31579.7632828367. The cubic root of 997281449 is about 999.0929939220.

The spelling of 997281449 in words is "nine hundred ninety-seven million, two hundred eighty-one thousand, four hundred forty-nine".