1151245261 has 2 divisors, whose sum is σ = 1151245262. Its totient is φ = 1151245260.

The previous prime is 1151245237. The next prime is 1151245297. The reversal of 1151245261 is 1625421511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151244900 + 361 = 33930^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151245261 - 2⁹ = 1151244749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151245231) 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, 575622630 + 575622631.

It is an arithmetic number, because the mean of its divisors is an integer number (575622631).

Almost surely, 2^1151245261 is an apocalyptic number.

It is an amenable number.

1151245261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151245261 is an equidigital number, since it uses as much as digits as its factorization.

1151245261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 28.

The square root of 1151245261 is about 33930.0053197756. The cubic root of 1151245261 is about 1048.0675752927.

Adding to 1151245261 its reverse (1625421511), we get a palindrome (2776666772).

The spelling of 1151245261 in words is "one billion, one hundred fifty-one million, two hundred forty-five thousand, two hundred sixty-one".