997924121 has 4 divisors (see below), whose sum is σ = 1016752932. Its totient is φ = 979095312.

The previous prime is 997924097. The next prime is 997924127. The reversal of 997924121 is 121429799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121429799 = 7057 ⋅17207.

It can be written as a sum of positive squares in 2 ways, for example, as 851997721 + 145926400 = 29189^2 + 12080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997924121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997924127) 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, 9414326 + ... + 9414431.

It is an arithmetic number, because the mean of its divisors is an integer number (254188233).

Almost surely, 2^997924121 is an apocalyptic number.

It is an amenable number.

997924121 is a deficient number, since it is larger than the sum of its proper divisors (18828811).

997924121 is a wasteful number, since it uses less digits than its factorization.

997924121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18828810.

The product of its digits is 81648, while the sum is 44.

The square root of 997924121 is about 31589.9370211465. The cubic root of 997924121 is about 999.3075609722.

The spelling of 997924121 in words is "nine hundred ninety-seven million, nine hundred twenty-four thousand, one hundred twenty-one".