1211350645 has 16 divisors (see below), whose sum is σ = 1464922368. Its totient is φ = 961571520.

The previous prime is 1211350603. The next prime is 1211350663. The reversal of 1211350645 is 5460531121.

It is not a de Polignac number, because 1211350645 - 2²⁹ = 674479733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 493812 + ... + 496258.

It is an arithmetic number, because the mean of its divisors is an integer number (91557648).

Almost surely, 2^1211350645 is an apocalyptic number.

It is an amenable number.

1211350645 is a deficient number, since it is larger than the sum of its proper divisors (253571723).

1211350645 is a wasteful number, since it uses less digits than its factorization.

1211350645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1211350645 is about 34804.4630040459. The cubic root of 1211350645 is about 1065.9985770285.

Adding to 1211350645 its reverse (5460531121), we get a palindrome (6671881766).

The spelling of 1211350645 in words is "one billion, two hundred eleven million, three hundred fifty thousand, six hundred forty-five".