521617373 has 2 divisors, whose sum is σ = 521617374. Its totient is φ = 521617372.

The previous prime is 521617367. The next prime is 521617381. The reversal of 521617373 is 373716125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521528569 + 88804 = 22837^2 + 298^2 .

It is a cyclic number.

It is not a de Polignac number, because 521617373 - 2⁴ = 521617357 is a prime.

It is a super-2 number, since 2×521617373² = 544169367630842258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521617363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260808686 + 260808687.

It is an arithmetic number, because the mean of its divisors is an integer number (260808687).

Almost surely, 2^521617373 is an apocalyptic number.

It is an amenable number.

521617373 is a deficient number, since it is larger than the sum of its proper divisors (1).

521617373 is an equidigital number, since it uses as much as digits as its factorization.

521617373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 35.

The square root of 521617373 is about 22838.9442181551. The cubic root of 521617373 is about 804.9780084781.

The spelling of 521617373 in words is "five hundred twenty-one million, six hundred seventeen thousand, three hundred seventy-three".