525553121 has 2 divisors, whose sum is σ = 525553122. Its totient is φ = 525553120.

The previous prime is 525553111. The next prime is 525553123. The reversal of 525553121 is 121355525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481144225 + 44408896 = 21935^2 + 6664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525553121 is a prime.

Together with 525553123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (525553123) 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 as a sum of consecutive naturals, namely, 262776560 + 262776561.

It is an arithmetic number, because the mean of its divisors is an integer number (262776561).

Almost surely, 2^525553121 is an apocalyptic number.

It is an amenable number.

525553121 is a deficient number, since it is larger than the sum of its proper divisors (1).

525553121 is an equidigital number, since it uses as much as digits as its factorization.

525553121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7500, while the sum is 29.

The square root of 525553121 is about 22924.9453870669. The cubic root of 525553121 is about 806.9975319144.

The spelling of 525553121 in words is "five hundred twenty-five million, five hundred fifty-three thousand, one hundred twenty-one".