1205249845949 has 4 divisors (see below), whose sum is σ = 1210559316864. Its totient is φ = 1199940375036.

The previous prime is 1205249845913. The next prime is 1205249845951. The reversal of 1205249845949 is 9495489425021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1205249845949 - 2⁸ = 1205249845693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205249845891 and 1205249845900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205249848949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2654735117 + ... + 2654735570.

It is an arithmetic number, because the mean of its divisors is an integer number (302639829216).

Almost surely, 2^{1205249845949} is an apocalyptic number.

It is an amenable number.

1205249845949 is a deficient number, since it is larger than the sum of its proper divisors (5309470915).

1205249845949 is an equidigital number, since it uses as much as digits as its factorization.

1205249845949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309470914.

The product of its (nonzero) digits is 37324800, while the sum is 62.

The spelling of 1205249845949 in words is "one trillion, two hundred five billion, two hundred forty-nine million, eight hundred forty-five thousand, nine hundred forty-nine".