71431687 has 2 divisors, whose sum is σ = 71431688. Its totient is φ = 71431686.

The previous prime is 71431639. The next prime is 71431693. The reversal of 71431687 is 78613417.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71431687 - 2¹⁹ = 70907399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71431627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35715843 + 35715844.

It is an arithmetic number, because the mean of its divisors is an integer number (35715844).

Almost surely, 2^71431687 is an apocalyptic number.

71431687 is a deficient number, since it is larger than the sum of its proper divisors (1).

71431687 is an equidigital number, since it uses as much as digits as its factorization.

71431687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 71431687 is about 8451.7268649667. The cubic root of 71431687 is about 414.9192991577.

The spelling of 71431687 in words is "seventy-one million, four hundred thirty-one thousand, six hundred eighty-seven".