997994121 has 4 divisors (see below), whose sum is σ = 1330658832. Its totient is φ = 665329412.

The previous prime is 997994119. The next prime is 997994131. The reversal of 997994121 is 121499799.

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 997994121 - 2¹ = 997994119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (997994111) 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, 166332351 + ... + 166332356.

It is an arithmetic number, because the mean of its divisors is an integer number (332664708).

Almost surely, 2^997994121 is an apocalyptic number.

It is an amenable number.

997994121 is a deficient number, since it is larger than the sum of its proper divisors (332664711).

997994121 is a wasteful number, since it uses less digits than its factorization.

997994121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332664710.

The product of its digits is 367416, while the sum is 51.

The square root of 997994121 is about 31591.0449494790. The cubic root of 997994121 is about 999.3309261066.

The spelling of 997994121 in words is "nine hundred ninety-seven million, nine hundred ninety-four thousand, one hundred twenty-one".