127785461 has 2 divisors, whose sum is σ = 127785462. Its totient is φ = 127785460.

The previous prime is 127785421. The next prime is 127785473. The reversal of 127785461 is 164587721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102131236 + 25654225 = 10106^2 + 5065^2 .

It is a cyclic number.

It is not a de Polignac number, because 127785461 - 2²² = 123591157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127785421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63892730 + 63892731.

It is an arithmetic number, because the mean of its divisors is an integer number (63892731).

Almost surely, 2^127785461 is an apocalyptic number.

It is an amenable number.

127785461 is a deficient number, since it is larger than the sum of its proper divisors (1).

127785461 is an equidigital number, since it uses as much as digits as its factorization.

127785461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 41.

The square root of 127785461 is about 11304.2231488944. The cubic root of 127785461 is about 503.6866977085.

The spelling of 127785461 in words is "one hundred twenty-seven million, seven hundred eighty-five thousand, four hundred sixty-one".