71887931 has 2 divisors, whose sum is σ = 71887932. Its totient is φ = 71887930.

The previous prime is 71887927. The next prime is 71887939. The reversal of 71887931 is 13978817.

It is a weak prime.

It is an emirp because it is prime and its reverse (13978817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71887931 - 2² = 71887927 is a prime.

It is a super-2 number, since 2×71887931² = 10335749246921522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71887939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35943965 + 35943966.

It is an arithmetic number, because the mean of its divisors is an integer number (35943966).

Almost surely, 2^71887931 is an apocalyptic number.

71887931 is a deficient number, since it is larger than the sum of its proper divisors (1).

71887931 is an equidigital number, since it uses as much as digits as its factorization.

71887931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 44.

The square root of 71887931 is about 8478.6750733826. The cubic root of 71887931 is about 415.8008072340.

The spelling of 71887931 in words is "seventy-one million, eight hundred eighty-seven thousand, nine hundred thirty-one".