1211104399 has 4 divisors (see below), whose sum is σ = 1263761136. Its totient is φ = 1158447664.

The previous prime is 1211104379. The next prime is 1211104457. The reversal of 1211104399 is 9934011121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211104399 - 2¹⁷ = 1210973327 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 1211104399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211104369) 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, 26328334 + ... + 26328379.

It is an arithmetic number, because the mean of its divisors is an integer number (315940284).

Almost surely, 2^1211104399 is an apocalyptic number.

1211104399 is a deficient number, since it is larger than the sum of its proper divisors (52656737).

1211104399 is an equidigital number, since it uses as much as digits as its factorization.

1211104399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52656736.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1211104399 is about 34800.9252606881. The cubic root of 1211104399 is about 1065.9263392952.

The spelling of 1211104399 in words is "one billion, two hundred eleven million, one hundred four thousand, three hundred ninety-nine".