1199742949 has 2 divisors, whose sum is σ = 1199742950. Its totient is φ = 1199742948.

The previous prime is 1199742923. The next prime is 1199742979. The reversal of 1199742949 is 9492479911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1184392225 + 15350724 = 34415^2 + 3918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1199742949 - 2¹¹ = 1199740901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1199742949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1199742979) 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, 599871474 + 599871475.

It is an arithmetic number, because the mean of its divisors is an integer number (599871475).

Almost surely, 2^1199742949 is an apocalyptic number.

It is an amenable number.

1199742949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1199742949 is an equidigital number, since it uses as much as digits as its factorization.

1199742949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 1199742949 is about 34637.3057410648. The cubic root of 1199742949 is about 1062.5826866953.

It can be divided in two parts, 11997 and 42949, that added together give a triangular number (54946 = T₃₃₁).

The spelling of 1199742949 in words is "one billion, one hundred ninety-nine million, seven hundred forty-two thousand, nine hundred forty-nine".