315053521 has 2 divisors, whose sum is σ = 315053522. Its totient is φ = 315053520.

The previous prime is 315053467. The next prime is 315053539. The reversal of 315053521 is 125350513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261177921 + 53875600 = 16161^2 + 7340^2 .

It is an emirp because it is prime and its reverse (125350513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315053521 - 2²³ = 306664913 is a prime.

It is not a weakly prime, because it can be changed into another prime (315053551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157526760 + 157526761.

It is an arithmetic number, because the mean of its divisors is an integer number (157526761).

Almost surely, 2^315053521 is an apocalyptic number.

It is an amenable number.

315053521 is a deficient number, since it is larger than the sum of its proper divisors (1).

315053521 is an equidigital number, since it uses as much as digits as its factorization.

315053521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 315053521 is about 17749.7470686204. The cubic root of 315053521 is about 680.4477450547.

The spelling of 315053521 in words is "three hundred fifteen million, fifty-three thousand, five hundred twenty-one".