318421261 has 2 divisors, whose sum is σ = 318421262. Its totient is φ = 318421260.

The previous prime is 318421241. The next prime is 318421331. The reversal of 318421261 is 162124813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170798761 + 147622500 = 13069^2 + 12150^2 .

It is a cyclic number.

It is not a de Polignac number, because 318421261 - 2¹⁹ = 317896973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318421241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159210630 + 159210631.

It is an arithmetic number, because the mean of its divisors is an integer number (159210631).

Almost surely, 2^318421261 is an apocalyptic number.

It is an amenable number.

318421261 is a deficient number, since it is larger than the sum of its proper divisors (1).

318421261 is an equidigital number, since it uses as much as digits as its factorization.

318421261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 318421261 is about 17844.3621628793. The cubic root of 318421261 is about 682.8636880542.

It can be divided in two parts, 3 and 18421261, that added together give a square (18421264 = 4292²).

The spelling of 318421261 in words is "three hundred eighteen million, four hundred twenty-one thousand, two hundred sixty-one".