526620221 has 2 divisors, whose sum is σ = 526620222. Its totient is φ = 526620220.

The previous prime is 526620217. The next prime is 526620247. The reversal of 526620221 is 122026625.

It is an a-pointer prime, because the next prime (526620247) can be obtained adding 526620221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526197721 + 422500 = 22939^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 526620221 - 2² = 526620217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (526610221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263310110 + 263310111.

It is an arithmetic number, because the mean of its divisors is an integer number (263310111).

Almost surely, 2^526620221 is an apocalyptic number.

It is an amenable number.

526620221 is a deficient number, since it is larger than the sum of its proper divisors (1).

526620221 is an equidigital number, since it uses as much as digits as its factorization.

526620221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 526620221 is about 22948.2073591817. The cubic root of 526620221 is about 807.5433472690.

Adding to 526620221 its reverse (122026625), we get a palindrome (648646846).

The spelling of 526620221 in words is "five hundred twenty-six million, six hundred twenty thousand, two hundred twenty-one".