31605405213 has 8 divisors (see below), whose sum is σ = 42354452448. Its totient is φ = 20963314064.

The previous prime is 31605405193. The next prime is 31605405229. The reversal of 31605405213 is 31250450613.

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 31605405213 - 2²⁸ = 31336969757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31605405283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26738331 + ... + 26739512.

It is an arithmetic number, because the mean of its divisors is an integer number (5294306556).

Almost surely, 2^31605405213 is an apocalyptic number.

It is an amenable number.

31605405213 is a deficient number, since it is larger than the sum of its proper divisors (10749047235).

31605405213 is a wasteful number, since it uses less digits than its factorization.

31605405213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53478043.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 31605405213 its reverse (31250450613), we get a palindrome (62855855826).

The spelling of 31605405213 in words is "thirty-one billion, six hundred five million, four hundred five thousand, two hundred thirteen".