1248591749 has 2 divisors, whose sum is σ = 1248591750. Its totient is φ = 1248591748.

The previous prime is 1248591697. The next prime is 1248591791. The reversal of 1248591749 is 9471958421.

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., 814702849 + 433888900 = 28543^2 + 20830^2 .

It is an emirp because it is prime and its reverse (9471958421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1248591749 - 2²⁴ = 1231814533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1248591697 and 1248591706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1248599749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624295874 + 624295875.

It is an arithmetic number, because the mean of its divisors is an integer number (624295875).

Almost surely, 2^1248591749 is an apocalyptic number.

It is an amenable number.

1248591749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248591749 is an equidigital number, since it uses as much as digits as its factorization.

1248591749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The square root of 1248591749 is about 35335.4177702769. The cubic root of 1248591749 is about 1076.8126616981.

The spelling of 1248591749 in words is "one billion, two hundred forty-eight million, five hundred ninety-one thousand, seven hundred forty-nine".