31878601010111 has 2 divisors, whose sum is σ = 31878601010112. Its totient is φ = 31878601010110.

The previous prime is 31878601010083. The next prime is 31878601010129. The reversal of 31878601010111 is 11101010687813.

It is a strong prime.

It is an emirp because it is prime and its reverse (11101010687813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31878601010111 - 2³⁰ = 31877527268287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31878601010141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15939300505055 + 15939300505056.

It is an arithmetic number, because the mean of its divisors is an integer number (15939300505056).

Almost surely, 2^{31878601010111} is an apocalyptic number.

31878601010111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31878601010111 is an equidigital number, since it uses as much as digits as its factorization.

31878601010111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 38.

Adding to 31878601010111 its reverse (11101010687813), we get a palindrome (42979611697924).

The spelling of 31878601010111 in words is "thirty-one trillion, eight hundred seventy-eight billion, six hundred one million, ten thousand, one hundred eleven".