31878874127 has 2 divisors, whose sum is σ = 31878874128. Its totient is φ = 31878874126.

The previous prime is 31878874091. The next prime is 31878874129. The reversal of 31878874127 is 72147887813.

It is a strong prime.

It is an emirp because it is prime and its reverse (72147887813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31878874127 - 2¹² = 31878870031 is a prime.

It is a super-2 number, since 2×31878874127² (a number of 22 digits) contains 22 as substring.

Together with 31878874129, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31878874129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15939437063 + 15939437064.

It is an arithmetic number, because the mean of its divisors is an integer number (15939437064).

Almost surely, 2^31878874127 is an apocalyptic number.

31878874127 is a deficient number, since it is larger than the sum of its proper divisors (1).

31878874127 is an equidigital number, since it uses as much as digits as its factorization.

31878874127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4214784, while the sum is 56.

The spelling of 31878874127 in words is "thirty-one billion, eight hundred seventy-eight million, eight hundred seventy-four thousand, one hundred twenty-seven".