521109893 has 2 divisors, whose sum is σ = 521109894. Its totient is φ = 521109892.

The previous prime is 521109811. The next prime is 521109917. The reversal of 521109893 is 398901125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342139009 + 178970884 = 18497^2 + 13378^2 .

It is a cyclic number.

It is not a de Polignac number, because 521109893 - 2¹⁰ = 521108869 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 (521109493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260554946 + 260554947.

It is an arithmetic number, because the mean of its divisors is an integer number (260554947).

Almost surely, 2^521109893 is an apocalyptic number.

It is an amenable number.

521109893 is a deficient number, since it is larger than the sum of its proper divisors (1).

521109893 is an equidigital number, since it uses as much as digits as its factorization.

521109893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 521109893 is about 22827.8315439728. The cubic root of 521109893 is about 804.7168701981.

The spelling of 521109893 in words is "five hundred twenty-one million, one hundred nine thousand, eight hundred ninety-three".