315621853 has 2 divisors, whose sum is σ = 315621854. Its totient is φ = 315621852.

The previous prime is 315621809. The next prime is 315621883. The reversal of 315621853 is 358126513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312653124 + 2968729 = 17682^2 + 1723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315621853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315621883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157810926 + 157810927.

It is an arithmetic number, because the mean of its divisors is an integer number (157810927).

Almost surely, 2^315621853 is an apocalyptic number.

It is an amenable number.

315621853 is a deficient number, since it is larger than the sum of its proper divisors (1).

315621853 is an equidigital number, since it uses as much as digits as its factorization.

315621853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 315621853 is about 17765.7494353602. The cubic root of 315621853 is about 680.8566575063.

The spelling of 315621853 in words is "three hundred fifteen million, six hundred twenty-one thousand, eight hundred fifty-three".