1248591791 has 2 divisors, whose sum is σ = 1248591792. Its totient is φ = 1248591790.

The previous prime is 1248591749. The next prime is 1248591797. The reversal of 1248591791 is 1971958421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1248591791 - 2¹⁴ = 1248575407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1248591797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624295895 + 624295896.

It is an arithmetic number, because the mean of its divisors is an integer number (624295896).

Almost surely, 2^1248591791 is an apocalyptic number.

1248591791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248591791 is an equidigital number, since it uses as much as digits as its factorization.

1248591791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 47.

The square root of 1248591791 is about 35335.4183645815. The cubic root of 1248591791 is about 1076.8126737720.

The spelling of 1248591791 in words is "one billion, two hundred forty-eight million, five hundred ninety-one thousand, seven hundred ninety-one".