7121997 has 12 divisors (see below), whose sum is σ = 10892700. Its totient is φ = 4468608.

The previous prime is 7121993. The next prime is 7121999. The reversal of 7121997 is 7991217.

7121997 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6380676 + 741321 = 2526^2 + 861^2 .

It is not a de Polignac number, because 7121997 - 2² = 7121993 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23122 + ... + 23427.

It is an arithmetic number, because the mean of its divisors is an integer number (907725).

Almost surely, 2^7121997 is an apocalyptic number.

It is an amenable number.

7121997 is a deficient number, since it is larger than the sum of its proper divisors (3770703).

7121997 is a wasteful number, since it uses less digits than its factorization.

7121997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46572 (or 46569 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 7121997 is about 2668.7069902857. The cubic root of 7121997 is about 192.3980187324.

It can be divided in two parts, 7121 and 997, that added together give a palindrome (8118).

The spelling of 7121997 in words is "seven million, one hundred twenty-one thousand, nine hundred ninety-seven".