71506391093 has 2 divisors, whose sum is σ = 71506391094. Its totient is φ = 71506391092.

The previous prime is 71506391071. The next prime is 71506391137. The reversal of 71506391093 is 39019360517.

It is an a-pointer prime, because the next prime (71506391137) can be obtained adding 71506391093 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40924076209 + 30582314884 = 202297^2 + 174878^2 .

It is a cyclic number.

It is not a de Polignac number, because 71506391093 - 2¹⁶ = 71506325557 is a prime.

It is a super-2 number, since 2×71506391093² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71506391053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35753195546 + 35753195547.

It is an arithmetic number, because the mean of its divisors is an integer number (35753195547).

Almost surely, 2^71506391093 is an apocalyptic number.

It is an amenable number.

71506391093 is a deficient number, since it is larger than the sum of its proper divisors (1).

71506391093 is an equidigital number, since it uses as much as digits as its factorization.

71506391093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 44.

The spelling of 71506391093 in words is "seventy-one billion, five hundred six million, three hundred ninety-one thousand, ninety-three".