1211925649 has 16 divisors (see below), whose sum is σ = 1341112320. Its totient is φ = 1085956560.

The previous prime is 1211925643. The next prime is 1211925677. The reversal of 1211925649 is 9465291121.

It is a cyclic number.

It is not a de Polignac number, because 1211925649 - 2³ = 1211925641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211925641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943962 + ... + 945244.

It is an arithmetic number, because the mean of its divisors is an integer number (83819520).

Almost surely, 2^1211925649 is an apocalyptic number.

It is an amenable number.

1211925649 is a deficient number, since it is larger than the sum of its proper divisors (129186671).

1211925649 is a wasteful number, since it uses less digits than its factorization.

1211925649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460.

The product of its digits is 38880, while the sum is 40.

The square root of 1211925649 is about 34812.7225163445. The cubic root of 1211925649 is about 1066.1672197713.

The spelling of 1211925649 in words is "one billion, two hundred eleven million, nine hundred twenty-five thousand, six hundred forty-nine".