1275847921 has 2 divisors, whose sum is σ = 1275847922. Its totient is φ = 1275847920.

The previous prime is 1275847913. The next prime is 1275847987. The reversal of 1275847921 is 1297485721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1215568225 + 60279696 = 34865^2 + 7764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275847921 - 2³ = 1275847913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275842921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637923960 + 637923961.

It is an arithmetic number, because the mean of its divisors is an integer number (637923961).

Almost surely, 2^1275847921 is an apocalyptic number.

It is an amenable number.

1275847921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275847921 is an equidigital number, since it uses as much as digits as its factorization.

1275847921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 46.

The square root of 1275847921 is about 35719.0134382236. The cubic root of 1275847921 is about 1084.5917669685.

The spelling of 1275847921 in words is "one billion, two hundred seventy-five million, eight hundred forty-seven thousand, nine hundred twenty-one".