71511073 has 2 divisors, whose sum is σ = 71511074. Its totient is φ = 71511072.

The previous prime is 71511049. The next prime is 71511101. The reversal of 71511073 is 37011517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66389904 + 5121169 = 8148^2 + 2263^2 .

It is an emirp because it is prime and its reverse (37011517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71511073 - 2²¹ = 69413921 is a prime.

It is a super-2 number, since 2×71511073² = 10227667123222658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71511173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35755536 + 35755537.

It is an arithmetic number, because the mean of its divisors is an integer number (35755537).

Almost surely, 2^71511073 is an apocalyptic number.

It is an amenable number.

71511073 is a deficient number, since it is larger than the sum of its proper divisors (1).

71511073 is an equidigital number, since it uses as much as digits as its factorization.

71511073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 735, while the sum is 25.

The square root of 71511073 is about 8456.4219975117. The cubic root of 71511073 is about 415.0729498701.

The spelling of 71511073 in words is "seventy-one million, five hundred eleven thousand, seventy-three".