1286520461 has 2 divisors, whose sum is σ = 1286520462. Its totient is φ = 1286520460.

The previous prime is 1286520421. The next prime is 1286520467. The reversal of 1286520461 is 1640256821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1196744836 + 89775625 = 34594^2 + 9475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1286520461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286520467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643260230 + 643260231.

It is an arithmetic number, because the mean of its divisors is an integer number (643260231).

Almost surely, 2^1286520461 is an apocalyptic number.

It is an amenable number.

1286520461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286520461 is an equidigital number, since it uses as much as digits as its factorization.

1286520461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1286520461 is about 35868.0980956616. The cubic root of 1286520461 is about 1087.6075971578.

The spelling of 1286520461 in words is "one billion, two hundred eighty-six million, five hundred twenty thousand, four hundred sixty-one".