520910381 has 2 divisors, whose sum is σ = 520910382. Its totient is φ = 520910380.

The previous prime is 520910333. The next prime is 520910389. The reversal of 520910381 is 183019025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447534025 + 73376356 = 21155^2 + 8566^2 .

It is a cyclic number.

It is not a de Polignac number, because 520910381 - 2¹⁰ = 520909357 is a prime.

It is a super-2 number, since 2×520910381² = 542695250067130322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520910389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260455190 + 260455191.

It is an arithmetic number, because the mean of its divisors is an integer number (260455191).

Almost surely, 2^520910381 is an apocalyptic number.

It is an amenable number.

520910381 is a deficient number, since it is larger than the sum of its proper divisors (1).

520910381 is an equidigital number, since it uses as much as digits as its factorization.

520910381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 520910381 is about 22823.4611967598. The cubic root of 520910381 is about 804.6141591908.

The spelling of 520910381 in words is "five hundred twenty million, nine hundred ten thousand, three hundred eighty-one".