71098661 has 2 divisors, whose sum is σ = 71098662. Its totient is φ = 71098660.

The previous prime is 71098613. The next prime is 71098667. The reversal of 71098661 is 16689017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71081761 + 16900 = 8431^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 71098661 - 2⁶ = 71098597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71098667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35549330 + 35549331.

It is an arithmetic number, because the mean of its divisors is an integer number (35549331).

Almost surely, 2^71098661 is an apocalyptic number.

It is an amenable number.

71098661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71098661 is an equidigital number, since it uses as much as digits as its factorization.

71098661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 71098661 is about 8432.0021940225. The cubic root of 71098661 is about 414.2734876806.

The spelling of 71098661 in words is "seventy-one million, ninety-eight thousand, six hundred sixty-one".