31540234213 has 16 divisors (see below), whose sum is σ = 34808025600. Its totient is φ = 28445543280.

The previous prime is 31540234199. The next prime is 31540234237. The reversal of 31540234213 is 31243204513.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31540234213 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 (31540234273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78823 + ... + 263236.

It is an arithmetic number, because the mean of its divisors is an integer number (2175501600).

Almost surely, 2^31540234213 is an apocalyptic number.

It is an amenable number.

31540234213 is a deficient number, since it is larger than the sum of its proper divisors (3267791387).

31540234213 is a wasteful number, since it uses less digits than its factorization.

31540234213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342312.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 31540234213 its reverse (31243204513), we get a palindrome (62783438726).

The spelling of 31540234213 in words is "thirty-one billion, five hundred forty million, two hundred thirty-four thousand, two hundred thirteen".