320687461 has 2 divisors, whose sum is σ = 320687462. Its totient is φ = 320687460.

The previous prime is 320687441. The next prime is 320687489. The reversal of 320687461 is 164786023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174398436 + 146289025 = 13206^2 + 12095^2 .

It is an emirp because it is prime and its reverse (164786023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320687461 - 2⁵ = 320687429 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320687461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320687441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160343730 + 160343731.

It is an arithmetic number, because the mean of its divisors is an integer number (160343731).

Almost surely, 2^320687461 is an apocalyptic number.

It is an amenable number.

320687461 is a deficient number, since it is larger than the sum of its proper divisors (1).

320687461 is an equidigital number, since it uses as much as digits as its factorization.

320687461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 320687461 is about 17907.7486301322. The cubic root of 320687461 is about 684.4798374065.

The spelling of 320687461 in words is "three hundred twenty million, six hundred eighty-seven thousand, four hundred sixty-one".