997749121 has 4 divisors (see below), whose sum is σ = 998027092.
Its totient is φ = 997471152.
The previous prime is 997749097. The next prime is 997749143. The reversal of 997749121 is 121947799.
997749121 = 223352 + 223362.
997749121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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 498852225 + 498896896 = 22335^2 + 22336^2
It is a cyclic number.
It is not a de Polignac number, because 997749121 - 217 = 997618049 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (997749421) 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, 133530 + ... + 140803.
It is an arithmetic number, because the mean of its divisors is an integer number (249506773).
Almost surely, 2997749121 is an apocalyptic number.
997749121 is the 22336-th centered square number.
It is an amenable number.
997749121 is a deficient number, since it is larger than the sum of its proper divisors (277971).
997749121 is a wasteful number, since it uses less digits than its factorization.
997749121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 277970.
The product of its digits is 285768, while the sum is 49.
The square root of 997749121 is about 31587.1670302989.
The cubic root of 997749121 is about 999.2491433554.
The spelling of 997749121 in words is "nine hundred ninety-seven million, seven hundred forty-nine thousand, one hundred twenty-one".