315055621 has 2 divisors, whose sum is σ = 315055622. Its totient is φ = 315055620.

The previous prime is 315055597. The next prime is 315055649. The reversal of 315055621 is 126550513.

It is an a-pointer prime, because the next prime (315055649) can be obtained adding 315055621 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241336225 + 73719396 = 15535^2 + 8586^2 .

It is an emirp because it is prime and its reverse (126550513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315055621 - 2⁵ = 315055589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315055621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315055661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157527810 + 157527811.

It is an arithmetic number, because the mean of its divisors is an integer number (157527811).

Almost surely, 2^315055621 is an apocalyptic number.

It is an amenable number.

315055621 is a deficient number, since it is larger than the sum of its proper divisors (1).

315055621 is an equidigital number, since it uses as much as digits as its factorization.

315055621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 315055621 is about 17749.8062242944. The cubic root of 315055621 is about 680.4492569006.

The spelling of 315055621 in words is "three hundred fifteen million, fifty-five thousand, six hundred twenty-one".