521140517 has 2 divisors, whose sum is σ = 521140518. Its totient is φ = 521140516.

The previous prime is 521140489. The next prime is 521140537. The reversal of 521140517 is 715041125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 513747556 + 7392961 = 22666^2 + 2719^2 .

It is a cyclic number.

It is not a de Polignac number, because 521140517 - 2⁸ = 521140261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521140537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260570258 + 260570259.

It is an arithmetic number, because the mean of its divisors is an integer number (260570259).

Almost surely, 2^521140517 is an apocalyptic number.

It is an amenable number.

521140517 is a deficient number, since it is larger than the sum of its proper divisors (1).

521140517 is an equidigital number, since it uses as much as digits as its factorization.

521140517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 521140517 is about 22828.5022942812. The cubic root of 521140517 is about 804.7326334545.

The spelling of 521140517 in words is "five hundred twenty-one million, one hundred forty thousand, five hundred seventeen".