521131937 has 2 divisors, whose sum is σ = 521131938. Its totient is φ = 521131936.

The previous prime is 521131913. The next prime is 521131969. The reversal of 521131937 is 739131125.

It is an a-pointer prime, because the next prime (521131969) can be obtained adding 521131937 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444324241 + 76807696 = 21079^2 + 8764^2 .

It is a cyclic number.

It is not a de Polignac number, because 521131937 - 2¹⁶ = 521066401 is a prime.

It is a super-2 number, since 2×521131937² = 543156991522743938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521131997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260565968 + 260565969.

It is an arithmetic number, because the mean of its divisors is an integer number (260565969).

Almost surely, 2^521131937 is an apocalyptic number.

It is an amenable number.

521131937 is a deficient number, since it is larger than the sum of its proper divisors (1).

521131937 is an equidigital number, since it uses as much as digits as its factorization.

521131937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 32.

The square root of 521131937 is about 22828.3143705356. The cubic root of 521131937 is about 804.7282170872.

The spelling of 521131937 in words is "five hundred twenty-one million, one hundred thirty-one thousand, nine hundred thirty-seven".