521654953 has 2 divisors, whose sum is σ = 521654954. Its totient is φ = 521654952.

The previous prime is 521654921. The next prime is 521654983. The reversal of 521654953 is 359456125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405941904 + 115713049 = 20148^2 + 10757^2 .

It is a cyclic number.

It is not a de Polignac number, because 521654953 - 2⁵ = 521654921 is a prime.

It is not a weakly prime, because it can be changed into another prime (521654983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260827476 + 260827477.

It is an arithmetic number, because the mean of its divisors is an integer number (260827477).

Almost surely, 2^521654953 is an apocalyptic number.

It is an amenable number.

521654953 is a deficient number, since it is larger than the sum of its proper divisors (1).

521654953 is an equidigital number, since it uses as much as digits as its factorization.

521654953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 40.

The square root of 521654953 is about 22839.7669208773. The cubic root of 521654953 is about 804.9973396000.

The spelling of 521654953 in words is "five hundred twenty-one million, six hundred fifty-four thousand, nine hundred fifty-three".