505212043409 has 4 divisors (see below), whose sum is σ = 505577875380. Its totient is φ = 504846211440.

The previous prime is 505212043361. The next prime is 505212043423. The reversal of 505212043409 is 904340212505.

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

It can be written as a sum of positive squares in 2 ways, for example, as 391410394384 + 113801649025 = 625628^2 + 337345^2 .

It is a cyclic number.

It is not a de Polignac number, because 505212043409 - 2¹² = 505212039313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505212043459) 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, 182913914 + ... + 182916675.

It is an arithmetic number, because the mean of its divisors is an integer number (126394468845).

Almost surely, 2^505212043409 is an apocalyptic number.

It is an amenable number.

505212043409 is a deficient number, since it is larger than the sum of its proper divisors (365831971).

505212043409 is a wasteful number, since it uses less digits than its factorization.

505212043409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365831970.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 505212043409 in words is "five hundred five billion, two hundred twelve million, forty-three thousand, four hundred nine".