1250263891 has 2 divisors, whose sum is σ = 1250263892. Its totient is φ = 1250263890.

The previous prime is 1250263879. The next prime is 1250263909. The reversal of 1250263891 is 1983620521.

It is a weak prime.

It is an emirp because it is prime and its reverse (1983620521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1250263891 - 2¹¹ = 1250261843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1250263891.

It is not a weakly prime, because it can be changed into another prime (1250263841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625131945 + 625131946.

It is an arithmetic number, because the mean of its divisors is an integer number (625131946).

Almost surely, 2^1250263891 is an apocalyptic number.

1250263891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1250263891 is an equidigital number, since it uses as much as digits as its factorization.

1250263891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1250263891 is about 35359.0708446927. The cubic root of 1250263891 is about 1077.2931444721.

The spelling of 1250263891 in words is "one billion, two hundred fifty million, two hundred sixty-three thousand, eight hundred ninety-one".