1275013891 has 2 divisors, whose sum is σ = 1275013892. Its totient is φ = 1275013890.

The previous prime is 1275013877. The next prime is 1275013907. The reversal of 1275013891 is 1983105721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1275013891 - 2²¹ = 1272916739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1275013891.

It is not a weakly prime, because it can be changed into another prime (1275013871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637506945 + 637506946.

It is an arithmetic number, because the mean of its divisors is an integer number (637506946).

Almost surely, 2^1275013891 is an apocalyptic number.

1275013891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275013891 is an equidigital number, since it uses as much as digits as its factorization.

1275013891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1275013891 is about 35707.3366550909. The cubic root of 1275013891 is about 1084.3553805784.

The spelling of 1275013891 in words is "one billion, two hundred seventy-five million, thirteen thousand, eight hundred ninety-one".