31405212013 has 8 divisors (see below), whose sum is σ = 36240134528. Its totient is φ = 26657405424.

The previous prime is 31405211989. The next prime is 31405212049. The reversal of 31405212013 is 31021250413.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31405212013 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 (31405212053) 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, 21778206 + ... + 21779647.

It is an arithmetic number, because the mean of its divisors is an integer number (4530016816).

Almost surely, 2^31405212013 is an apocalyptic number.

It is an amenable number.

31405212013 is a deficient number, since it is larger than the sum of its proper divisors (4834922515).

31405212013 is a wasteful number, since it uses less digits than its factorization.

31405212013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43557963.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 31405212013 its reverse (31021250413), we get a palindrome (62426462426).

The spelling of 31405212013 in words is "thirty-one billion, four hundred five million, two hundred twelve thousand, thirteen".