526390661 has 2 divisors, whose sum is σ = 526390662. Its totient is φ = 526390660.

The previous prime is 526390651. The next prime is 526390679. The reversal of 526390661 is 166093625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372258436 + 154132225 = 19294^2 + 12415^2 .

It is a cyclic number.

It is not a de Polignac number, because 526390661 - 2¹⁸ = 526128517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (526390651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263195330 + 263195331.

It is an arithmetic number, because the mean of its divisors is an integer number (263195331).

Almost surely, 2^526390661 is an apocalyptic number.

It is an amenable number.

526390661 is a deficient number, since it is larger than the sum of its proper divisors (1).

526390661 is an equidigital number, since it uses as much as digits as its factorization.

526390661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 526390661 is about 22943.2051161123. The cubic root of 526390661 is about 807.4259909742.

The spelling of 526390661 in words is "five hundred twenty-six million, three hundred ninety thousand, six hundred sixty-one".