1149023861 has 2 divisors, whose sum is σ = 1149023862. Its totient is φ = 1149023860.

The previous prime is 1149023851. The next prime is 1149023873. The reversal of 1149023861 is 1683209411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 835556836 + 313467025 = 28906^2 + 17705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1149023861 - 2¹⁰ = 1149022837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1149023831) 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, 574511930 + 574511931.

It is an arithmetic number, because the mean of its divisors is an integer number (574511931).

Almost surely, 2^1149023861 is an apocalyptic number.

It is an amenable number.

1149023861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1149023861 is an equidigital number, since it uses as much as digits as its factorization.

1149023861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1149023861 is about 33897.2544758421. The cubic root of 1149023861 is about 1047.3930371925.

The spelling of 1149023861 in words is "one billion, one hundred forty-nine million, twenty-three thousand, eight hundred sixty-one".