71370661 has 2 divisors, whose sum is σ = 71370662. Its totient is φ = 71370660.

The previous prime is 71370659. The next prime is 71370667. The reversal of 71370661 is 16607317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38365636 + 33005025 = 6194^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 71370661 - 2¹ = 71370659 is a prime.

Together with 71370659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71370667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35685330 + 35685331.

It is an arithmetic number, because the mean of its divisors is an integer number (35685331).

Almost surely, 2^71370661 is an apocalyptic number.

It is an amenable number.

71370661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71370661 is an equidigital number, since it uses as much as digits as its factorization.

71370661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 71370661 is about 8448.1158254371. The cubic root of 71370661 is about 414.8011066094.

Adding to 71370661 its reverse (16607317), we get a palindrome (87977978).

The spelling of 71370661 in words is "seventy-one million, three hundred seventy thousand, six hundred sixty-one".