7129121 has 6 divisors (see below), whose sum is σ = 7308966. Its totient is φ = 6953600.

The previous prime is 7129117. The next prime is 7129127. The reversal of 7129121 is 1219217.

It can be written as a sum of positive squares in 3 ways, for example, as 180625 + 6948496 = 425^2 + 2636^2 .

It is not a de Polignac number, because 7129121 - 2² = 7129117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7129127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 440 + ... + 3801.

It is an arithmetic number, because the mean of its divisors is an integer number (1218161).

Almost surely, 2^7129121 is an apocalyptic number.

It is an amenable number.

7129121 is a deficient number, since it is larger than the sum of its proper divisors (179845).

7129121 is an equidigital number, since it uses as much as digits as its factorization.

7129121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323 (or 4282 counting only the distinct ones).

The product of its digits is 252, while the sum is 23.

The square root of 7129121 is about 2670.0413854470. The cubic root of 7129121 is about 192.4621480644.

It can be divided in two parts, 71 and 29121, that added together give a palindrome (29192).

The spelling of 7129121 in words is "seven million, one hundred twenty-nine thousand, one hundred twenty-one".