315670261 has 2 divisors, whose sum is σ = 315670262. Its totient is φ = 315670260.

The previous prime is 315670217. The next prime is 315670309. The reversal of 315670261 is 162076513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192682161 + 122988100 = 13881^2 + 11090^2 .

It is an emirp because it is prime and its reverse (162076513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315670261 - 2¹⁵ = 315637493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315670661) 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, 157835130 + 157835131.

It is an arithmetic number, because the mean of its divisors is an integer number (157835131).

Almost surely, 2^315670261 is an apocalyptic number.

It is an amenable number.

315670261 is a deficient number, since it is larger than the sum of its proper divisors (1).

315670261 is an equidigital number, since it uses as much as digits as its factorization.

315670261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 315670261 is about 17767.1117799152. Note that the first 3 decimals coincide. The cubic root of 315670261 is about 680.8914641627.

The spelling of 315670261 in words is "three hundred fifteen million, six hundred seventy thousand, two hundred sixty-one".