521350261 has 2 divisors, whose sum is σ = 521350262. Its totient is φ = 521350260.

The previous prime is 521350217. The next prime is 521350279. The reversal of 521350261 is 162053125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342620100 + 178730161 = 18510^2 + 13369^2 .

It is a cyclic number.

It is not a de Polignac number, because 521350261 - 2⁹ = 521349749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521350061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260675130 + 260675131.

It is an arithmetic number, because the mean of its divisors is an integer number (260675131).

Almost surely, 2^521350261 is an apocalyptic number.

It is an amenable number.

521350261 is a deficient number, since it is larger than the sum of its proper divisors (1).

521350261 is an equidigital number, since it uses as much as digits as its factorization.

521350261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 521350261 is about 22833.0957384232. The cubic root of 521350261 is about 804.8405795183.

The spelling of 521350261 in words is "five hundred twenty-one million, three hundred fifty thousand, two hundred sixty-one".