1211325645 has 16 divisors (see below), whose sum is σ = 1938620160. Its totient is φ = 645873984.

The previous prime is 1211325593. The next prime is 1211325671. The reversal of 1211325645 is 5465231121.

It is not a de Polignac number, because 1211325645 - 2⁷ = 1211325517 is a prime.

It is a super-3 number, since 3×1211325645³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69691 + ... + 85319.

It is an arithmetic number, because the mean of its divisors is an integer number (121163760).

Almost surely, 2^1211325645 is an apocalyptic number.

1211325645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211325645 is a deficient number, since it is larger than the sum of its proper divisors (727294515).

1211325645 is a wasteful number, since it uses less digits than its factorization.

1211325645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20804.

The product of its digits is 7200, while the sum is 30.

The square root of 1211325645 is about 34804.1038528505. The cubic root of 1211325645 is about 1065.9912435759.

Adding to 1211325645 its reverse (5465231121), we get a palindrome (6676556766).

The spelling of 1211325645 in words is "one billion, two hundred eleven million, three hundred twenty-five thousand, six hundred forty-five".