405131213 has 4 divisors (see below), whose sum is σ = 406916160. Its totient is φ = 403346268.

The previous prime is 405131203. The next prime is 405131231. The reversal of 405131213 is 312131504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405131213 - 2¹² = 405127117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405131203) 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, 892133 + ... + 892586.

It is an arithmetic number, because the mean of its divisors is an integer number (101729040).

Almost surely, 2^405131213 is an apocalyptic number.

It is an amenable number.

405131213 is a deficient number, since it is larger than the sum of its proper divisors (1784947).

405131213 is a wasteful number, since it uses less digits than its factorization.

405131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784946.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 405131213 is about 20127.8715466887. The cubic root of 405131213 is about 739.9435146805.

Adding to 405131213 its reverse (312131504), we get a palindrome (717262717).

The spelling of 405131213 in words is "four hundred five million, one hundred thirty-one thousand, two hundred thirteen".