1211132665 has 8 divisors (see below), whose sum is σ = 1453989960. Its totient is φ = 968485632.

The previous prime is 1211132653. The next prime is 1211132687. The reversal of 1211132665 is 5662311121.

It can be written as a sum of positive squares in 4 ways, for example, as 39576681 + 1171555984 = 6291^2 + 34228^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1211132665 - 2⁵ = 1211132633 is a prime.

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, 39600 + ... + 63169.

It is an arithmetic number, because the mean of its divisors is an integer number (181748745).

Almost surely, 2^1211132665 is an apocalyptic number.

It is an amenable number.

1211132665 is a deficient number, since it is larger than the sum of its proper divisors (242857295).

1211132665 is a wasteful number, since it uses less digits than its factorization.

1211132665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105131.

The product of its digits is 2160, while the sum is 28.

The square root of 1211132665 is about 34801.3313682106. The cubic root of 1211132665 is about 1065.9346317924.

Adding to 1211132665 its reverse (5662311121), we get a palindrome (6873443786).

The spelling of 1211132665 in words is "one billion, two hundred eleven million, one hundred thirty-two thousand, six hundred sixty-five".