521557097 has 2 divisors, whose sum is σ = 521557098. Its totient is φ = 521557096.

The previous prime is 521557079. The next prime is 521557121. The reversal of 521557097 is 790755125.

Together with previous prime (521557079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500909161 + 20647936 = 22381^2 + 4544^2 .

It is a cyclic number.

It is not a de Polignac number, because 521557097 - 2¹⁴ = 521540713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521557027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260778548 + 260778549.

It is an arithmetic number, because the mean of its divisors is an integer number (260778549).

Almost surely, 2^521557097 is an apocalyptic number.

It is an amenable number.

521557097 is a deficient number, since it is larger than the sum of its proper divisors (1).

521557097 is an equidigital number, since it uses as much as digits as its factorization.

521557097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110250, while the sum is 41.

The square root of 521557097 is about 22837.6245918878. The cubic root of 521557097 is about 804.9470006129.

The spelling of 521557097 in words is "five hundred twenty-one million, five hundred fifty-seven thousand, ninety-seven".