71513161 has 2 divisors, whose sum is σ = 71513162. Its totient is φ = 71513160.

The previous prime is 71513149. The next prime is 71513219. The reversal of 71513161 is 16131517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62094400 + 9418761 = 7880^2 + 3069^2 .

It is a cyclic number.

It is not a de Polignac number, because 71513161 - 2¹⁷ = 71382089 is a prime.

It is a super-2 number, since 2×71513161² = 10228264392423842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71513261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35756580 + 35756581.

It is an arithmetic number, because the mean of its divisors is an integer number (35756581).

Almost surely, 2^71513161 is an apocalyptic number.

It is an amenable number.

71513161 is a deficient number, since it is larger than the sum of its proper divisors (1).

71513161 is an equidigital number, since it uses as much as digits as its factorization.

71513161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 25.

The square root of 71513161 is about 8456.5454530795. The cubic root of 71513161 is about 415.0769896355.

Adding to 71513161 its reverse (16131517), we get a palindrome (87644678).

The spelling of 71513161 in words is "seventy-one million, five hundred thirteen thousand, one hundred sixty-one".