521412243623 has 2 divisors, whose sum is σ = 521412243624. Its totient is φ = 521412243622.

The previous prime is 521412243593. The next prime is 521412243641. The reversal of 521412243623 is 326342214125.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521412243623 - 2¹⁰ = 521412242599 is a prime.

It is a super-2 number, since 2×521412243623² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521412243643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260706121811 + 260706121812.

It is an arithmetic number, because the mean of its divisors is an integer number (260706121812).

Almost surely, 2^521412243623 is an apocalyptic number.

521412243623 is a deficient number, since it is larger than the sum of its proper divisors (1).

521412243623 is an equidigital number, since it uses as much as digits as its factorization.

521412243623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 35.

Adding to 521412243623 its reverse (326342214125), we get a palindrome (847754457748).

The spelling of 521412243623 in words is "five hundred twenty-one billion, four hundred twelve million, two hundred forty-three thousand, six hundred twenty-three".