521649677 has 2 divisors, whose sum is σ = 521649678. Its totient is φ = 521649676.

The previous prime is 521649671. The next prime is 521649701. The reversal of 521649677 is 776946125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402162916 + 119486761 = 20054^2 + 10931^2 .

It is a cyclic number.

It is not a de Polignac number, because 521649677 - 2¹⁰ = 521648653 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 (521649671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260824838 + 260824839.

It is an arithmetic number, because the mean of its divisors is an integer number (260824839).

Almost surely, 2^521649677 is an apocalyptic number.

It is an amenable number.

521649677 is a deficient number, since it is larger than the sum of its proper divisors (1).

521649677 is an equidigital number, since it uses as much as digits as its factorization.

521649677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 521649677 is about 22839.6514202822. The cubic root of 521649677 is about 804.9946256859.

The spelling of 521649677 in words is "five hundred twenty-one million, six hundred forty-nine thousand, six hundred seventy-seven".