521408957 has 2 divisors, whose sum is σ = 521408958. Its totient is φ = 521408956.

The previous prime is 521408947. The next prime is 521408971. The reversal of 521408957 is 759804125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315027001 + 206381956 = 17749^2 + 14366^2 .

It is a cyclic number.

It is not a de Polignac number, because 521408957 - 2¹⁰ = 521407933 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 (521408947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260704478 + 260704479.

It is an arithmetic number, because the mean of its divisors is an integer number (260704479).

Almost surely, 2^521408957 is an apocalyptic number.

It is an amenable number.

521408957 is a deficient number, since it is larger than the sum of its proper divisors (1).

521408957 is an equidigital number, since it uses as much as digits as its factorization.

521408957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 521408957 is about 22834.3810294915. The cubic root of 521408957 is about 804.8707825977.

The spelling of 521408957 in words is "five hundred twenty-one million, four hundred eight thousand, nine hundred fifty-seven".