522011621 has 2 divisors, whose sum is σ = 522011622. Its totient is φ = 522011620.

The previous prime is 522011597. The next prime is 522011627. The reversal of 522011621 is 126110225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295358596 + 226653025 = 17186^2 + 15055^2 .

It is a cyclic number.

It is not a de Polignac number, because 522011621 - 2²⁶ = 454902757 is a prime.

It is a super-2 number, since 2×522011621² = 544992264918095282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 522011593 and 522011602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (522011627) 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, 261005810 + 261005811.

It is an arithmetic number, because the mean of its divisors is an integer number (261005811).

Almost surely, 2^522011621 is an apocalyptic number.

It is an amenable number.

522011621 is a deficient number, since it is larger than the sum of its proper divisors (1).

522011621 is an equidigital number, since it uses as much as digits as its factorization.

522011621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 522011621 is about 22847.5736348523. The cubic root of 522011621 is about 805.1807631307.

Adding to 522011621 its reverse (126110225), we get a palindrome (648121846).

The spelling of 522011621 in words is "five hundred twenty-two million, eleven thousand, six hundred twenty-one".