521375047 has 2 divisors, whose sum is σ = 521375048. Its totient is φ = 521375046.

The previous prime is 521375033. The next prime is 521375053. The reversal of 521375047 is 740573125.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521375047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521375027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260687523 + 260687524.

It is an arithmetic number, because the mean of its divisors is an integer number (260687524).

Almost surely, 2^521375047 is an apocalyptic number.

521375047 is a deficient number, since it is larger than the sum of its proper divisors (1).

521375047 is an equidigital number, since it uses as much as digits as its factorization.

521375047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 521375047 is about 22833.6384967442. The cubic root of 521375047 is about 804.8533338756.

The spelling of 521375047 in words is "five hundred twenty-one million, three hundred seventy-five thousand, forty-seven".