1211007945 has 32 divisors (see below), whose sum is σ = 2216890368. Its totient is φ = 552984768.

The previous prime is 1211007907. The next prime is 1211007949. The reversal of 1211007945 is 5497001121.

It is not a de Polignac number, because 1211007945 - 2⁸ = 1211007689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211007949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95572 + ... + 107498.

It is an arithmetic number, because the mean of its divisors is an integer number (69277824).

Almost surely, 2^1211007945 is an apocalyptic number.

1211007945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211007945 is a deficient number, since it is larger than the sum of its proper divisors (1005882423).

1211007945 is a wasteful number, since it uses less digits than its factorization.

1211007945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12909.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1211007945 is about 34799.5394366075. The cubic root of 1211007945 is about 1065.8980412699.

The spelling of 1211007945 in words is "one billion, two hundred eleven million, seven thousand, nine hundred forty-five".