1248775261 has 2 divisors, whose sum is σ = 1248775262. Its totient is φ = 1248775260.

The previous prime is 1248775259. The next prime is 1248775267. The reversal of 1248775261 is 1625778421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 812592036 + 436183225 = 28506^2 + 20885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1248775261 - 2¹ = 1248775259 is a prime.

Together with 1248775259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1248775267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624387630 + 624387631.

It is an arithmetic number, because the mean of its divisors is an integer number (624387631).

Almost surely, 2^1248775261 is an apocalyptic number.

It is an amenable number.

1248775261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248775261 is an equidigital number, since it uses as much as digits as its factorization.

1248775261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 1248775261 is about 35338.0143896060. The cubic root of 1248775261 is about 1076.8654140262.

The spelling of 1248775261 in words is "one billion, two hundred forty-eight million, seven hundred seventy-five thousand, two hundred sixty-one".