1211646145 has 8 divisors (see below), whose sum is σ = 1489438440. Its totient is φ = 945674880.

The previous prime is 1211646133. The next prime is 1211646179. The reversal of 1211646145 is 5416461121.

It can be written as a sum of positive squares in 4 ways, for example, as 28217344 + 1183428801 = 5312^2 + 34401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211646145 - 2¹⁷ = 1211515073 is a prime.

It is a super-2 number, since 2×1211646145² = 2936172761386722050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2955030 + ... + 2955439.

It is an arithmetic number, because the mean of its divisors is an integer number (186179805).

Almost surely, 2^1211646145 is an apocalyptic number.

It is an amenable number.

1211646145 is a deficient number, since it is larger than the sum of its proper divisors (277792295).

1211646145 is an equidigital number, since it uses as much as digits as its factorization.

1211646145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910515.

The product of its digits is 5760, while the sum is 31.

The square root of 1211646145 is about 34808.7078904116. The cubic root of 1211646145 is about 1066.0852507950.

The spelling of 1211646145 in words is "one billion, two hundred eleven million, six hundred forty-six thousand, one hundred forty-five".