1211371465 has 16 divisors (see below), whose sum is σ = 1540985472. Its totient is φ = 911006464.

The previous prime is 1211371463. The next prime is 1211371487. The reversal of 1211371465 is 5641731121.

It is a cyclic number.

It is not a de Polignac number, because 1211371465 - 2¹ = 1211371463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211371463) 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 15 ways as a sum of consecutive naturals, for example, 67362 + ... + 83428.

It is an arithmetic number, because the mean of its divisors is an integer number (96311592).

Almost surely, 2^1211371465 is an apocalyptic number.

It is an amenable number.

1211371465 is a deficient number, since it is larger than the sum of its proper divisors (329614007).

1211371465 is a wasteful number, since it uses less digits than its factorization.

1211371465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16976.

The product of its digits is 5040, while the sum is 31.

The square root of 1211371465 is about 34804.7621023331. The cubic root of 1211371465 is about 1066.0046842509.

The spelling of 1211371465 in words is "one billion, two hundred eleven million, three hundred seventy-one thousand, four hundred sixty-five".