7551121 has 2 divisors, whose sum is σ = 7551122. Its totient is φ = 7551120.

The previous prime is 7551119. The next prime is 7551127. The reversal of 7551121 is 1211557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 261121 = 2700^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 7551121 - 2¹ = 7551119 is a prime.

Together with 7551119, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7551092 and 7551101.

It is not a weakly prime, because it can be changed into another prime (7551127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3775560 + 3775561.

It is an arithmetic number, because the mean of its divisors is an integer number (3775561).

Almost surely, 2^7551121 is an apocalyptic number.

It is an amenable number.

7551121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7551121 is an equidigital number, since it uses as much as digits as its factorization.

7551121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 350, while the sum is 22.

The square root of 7551121 is about 2747.9303120713. The cubic root of 7551121 is about 196.1871130675.

Adding to 7551121 its reverse (1211557), we get a palindrome (8762678).

The spelling of 7551121 in words is "seven million, five hundred fifty-one thousand, one hundred twenty-one".