71431693 has 2 divisors, whose sum is σ = 71431694. Its totient is φ = 71431692.

The previous prime is 71431687. The next prime is 71431769. The reversal of 71431693 is 39613417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68112009 + 3319684 = 8253^2 + 1822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71431693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71431993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35715846 + 35715847.

It is an arithmetic number, because the mean of its divisors is an integer number (35715847).

Almost surely, 2^71431693 is an apocalyptic number.

It is an amenable number.

71431693 is a deficient number, since it is larger than the sum of its proper divisors (1).

71431693 is an equidigital number, since it uses as much as digits as its factorization.

71431693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 71431693 is about 8451.7272199237. The cubic root of 71431693 is about 414.9193107749.

It can be divided in two parts, 7143 and 1693, that added together give a square (8836 = 94²).

The spelling of 71431693 in words is "seventy-one million, four hundred thirty-one thousand, six hundred ninety-three".