71081611 has 2 divisors, whose sum is σ = 71081612. Its totient is φ = 71081610.

The previous prime is 71081567. The next prime is 71081629. The reversal of 71081611 is 11618017.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71081611 - 2¹³ = 71073419 is a prime.

It is not a weakly prime, because it can be changed into another prime (71081911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35540805 + 35540806.

It is an arithmetic number, because the mean of its divisors is an integer number (35540806).

Almost surely, 2^71081611 is an apocalyptic number.

71081611 is a deficient number, since it is larger than the sum of its proper divisors (1).

71081611 is an equidigital number, since it uses as much as digits as its factorization.

71081611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 25.

The square root of 71081611 is about 8430.9911042534. The cubic root of 71081611 is about 414.2403697214.

Adding to 71081611 its reverse (11618017), we get a palindrome (82699628).

The spelling of 71081611 in words is "seventy-one million, eighty-one thousand, six hundred eleven".