31555140213 has 4 divisors (see below), whose sum is σ = 42073520288. Its totient is φ = 21036760140.

The previous prime is 31555140209. The next prime is 31555140229. The reversal of 31555140213 is 31204155513.

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 not a de Polignac number, because 31555140213 - 2² = 31555140209 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 (31555140203) 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, 5259190033 + ... + 5259190038.

It is an arithmetic number, because the mean of its divisors is an integer number (10518380072).

Almost surely, 2^31555140213 is an apocalyptic number.

It is an amenable number.

31555140213 is a deficient number, since it is larger than the sum of its proper divisors (10518380075).

31555140213 is a wasteful number, since it uses less digits than its factorization.

31555140213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10518380074.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 31555140213 its reverse (31204155513), we get a palindrome (62759295726).

The spelling of 31555140213 in words is "thirty-one billion, five hundred fifty-five million, one hundred forty thousand, two hundred thirteen".