1286945213 has 2 divisors, whose sum is σ = 1286945214. Its totient is φ = 1286945212.

The previous prime is 1286945201. The next prime is 1286945239. The reversal of 1286945213 is 3125496821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686597209 + 600348004 = 26203^2 + 24502^2 .

It is an emirp because it is prime and its reverse (3125496821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1286945213 - 2⁸ = 1286944957 is a prime.

It is a super-3 number, since 3×1286945213³ (a number of 28 digits) contains 333 as substring.

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 (1286945263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643472606 + 643472607.

It is an arithmetic number, because the mean of its divisors is an integer number (643472607).

Almost surely, 2^1286945213 is an apocalyptic number.

It is an amenable number.

1286945213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286945213 is an equidigital number, since it uses as much as digits as its factorization.

1286945213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 1286945213 is about 35874.0186346609. The cubic root of 1286945213 is about 1087.7272772524.

The spelling of 1286945213 in words is "one billion, two hundred eighty-six million, nine hundred forty-five thousand, two hundred thirteen".