1212053405 has 12 divisors (see below), whose sum is σ = 1506352692. Its totient is φ = 936203520.

The previous prime is 1212053371. The next prime is 1212053411. The reversal of 1212053405 is 5043502121.

It can be written as a sum of positive squares in 6 ways, for example, as 38809 + 1212014596 = 197^2 + 34814^2 .

It is not a de Polignac number, because 1212053405 - 2¹² = 1212049309 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 11 ways as a sum of consecutive naturals, for example, 139916 + ... + 148325.

It is an arithmetic number, because the mean of its divisors is an integer number (125529391).

Almost surely, 2^1212053405 is an apocalyptic number.

It is an amenable number.

1212053405 is a deficient number, since it is larger than the sum of its proper divisors (294299287).

1212053405 is an equidigital number, since it uses as much as digits as its factorization.

1212053405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288304 (or 288275 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1212053405 is about 34814.5573718811. The cubic root of 1212053405 is about 1066.2046820457.

Adding to 1212053405 its reverse (5043502121), we get a palindrome (6255555526).

The spelling of 1212053405 in words is "one billion, two hundred twelve million, fifty-three thousand, four hundred five".