521161133 has 2 divisors, whose sum is σ = 521161134. Its totient is φ = 521161132.

The previous prime is 521161093. The next prime is 521161139. The reversal of 521161133 is 331161125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342324004 + 178837129 = 18502^2 + 13373^2 .

It is a cyclic number.

It is not a de Polignac number, because 521161133 - 2⁸ = 521160877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521161099 and 521161108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521161139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260580566 + 260580567.

It is an arithmetic number, because the mean of its divisors is an integer number (260580567).

Almost surely, 2^521161133 is an apocalyptic number.

It is an amenable number.

521161133 is a deficient number, since it is larger than the sum of its proper divisors (1).

521161133 is an equidigital number, since it uses as much as digits as its factorization.

521161133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

The square root of 521161133 is about 22828.9538306073. The cubic root of 521161133 is about 804.7432448915.

The spelling of 521161133 in words is "five hundred twenty-one million, one hundred sixty-one thousand, one hundred thirty-three".