526663421 has 2 divisors, whose sum is σ = 526663422. Its totient is φ = 526663420.

The previous prime is 526663373. The next prime is 526663477. The reversal of 526663421 is 124366625.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319015321 + 207648100 = 17861^2 + 14410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-526663421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (526663021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263331710 + 263331711.

It is an arithmetic number, because the mean of its divisors is an integer number (263331711).

Almost surely, 2^526663421 is an apocalyptic number.

It is an amenable number.

526663421 is a deficient number, since it is larger than the sum of its proper divisors (1).

526663421 is an equidigital number, since it uses as much as digits as its factorization.

526663421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 526663421 is about 22949.1485898715. The cubic root of 526663421 is about 807.5654282788.

The spelling of 526663421 in words is "five hundred twenty-six million, six hundred sixty-three thousand, four hundred twenty-one".