1211040001 has 4 divisors (see below), whose sum is σ = 1240577604. Its totient is φ = 1181502400.

The previous prime is 1211039957. The next prime is 1211040011. The reversal of 1211040001 is 1000401121.

It is a Cunningham number, because it is equal to 34800²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000401121 = 1499 ⋅667379.

It can be written as a sum of positive squares in 2 ways, for example, as 58369600 + 1152670401 = 7640^2 + 33951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211040001 - 2²⁷ = 1076822273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211040001.

It is not an unprimeable number, because it can be changed into a prime (1211040011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14768740 + ... + 14768821.

It is an arithmetic number, because the mean of its divisors is an integer number (310144401).

Almost surely, 2^1211040001 is an apocalyptic number.

It is an amenable number.

1211040001 is a deficient number, since it is larger than the sum of its proper divisors (29537603).

1211040001 is an equidigital number, since it uses as much as digits as its factorization.

1211040001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29537602.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1211040001 is about 34800.0000143678. Note that the first 4 decimals coincide. The cubic root of 1211040001 is about 1065.9074461425.

Adding to 1211040001 its reverse (1000401121), we get a palindrome (2211441122).

The spelling of 1211040001 in words is "one billion, two hundred eleven million, forty thousand, one".