1211053405 has 8 divisors (see below), whose sum is σ = 1455427512. Its totient is φ = 967400448.

The previous prime is 1211053397. The next prime is 1211053423. The reversal of 1211053405 is 5043501121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 115906756 + 1095146649 = 10766^2 + 33093^2 .

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 1211053405 - 2³ = 1211053397 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 176584 + ... + 183313.

It is an arithmetic number, because the mean of its divisors is an integer number (181928439).

Almost surely, 2^1211053405 is an apocalyptic number.

It is an amenable number.

1211053405 is a deficient number, since it is larger than the sum of its proper divisors (244374107).

1211053405 is an equidigital number, since it uses as much as digits as its factorization.

1211053405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360575.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1211053405 is about 34800.1926000417. The cubic root of 1211053405 is about 1065.9113786772.

Adding to 1211053405 its reverse (5043501121), we get a palindrome (6254554526).

The spelling of 1211053405 in words is "one billion, two hundred eleven million, fifty-three thousand, four hundred five".