1270865861 has 2 divisors, whose sum is σ = 1270865862. Its totient is φ = 1270865860.

The previous prime is 1270865839. The next prime is 1270865873. The reversal of 1270865861 is 1685680721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1265153761 + 5712100 = 35569^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1270865861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1270865891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635432930 + 635432931.

It is an arithmetic number, because the mean of its divisors is an integer number (635432931).

Almost surely, 2^1270865861 is an apocalyptic number.

It is an amenable number.

1270865861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1270865861 is an equidigital number, since it uses as much as digits as its factorization.

1270865861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 1270865861 is about 35649.2056152728. The cubic root of 1270865861 is about 1083.1781841930.

The spelling of 1270865861 in words is "one billion, two hundred seventy million, eight hundred sixty-five thousand, eight hundred sixty-one".