70089661 has 2 divisors, whose sum is σ = 70089662. Its totient is φ = 70089660.

The previous prime is 70089659. The next prime is 70089697. The reversal of 70089661 is 16698007.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70056900 + 32761 = 8370^2 + 181^2 .

It is an emirp because it is prime and its reverse (16698007) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70089661 - 2¹ = 70089659 is a prime.

Together with 70089659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70089661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70089641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35044830 + 35044831.

It is an arithmetic number, because the mean of its divisors is an integer number (35044831).

Almost surely, 2^70089661 is an apocalyptic number.

It is an amenable number.

70089661 is a deficient number, since it is larger than the sum of its proper divisors (1).

70089661 is an equidigital number, since it uses as much as digits as its factorization.

70089661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 70089661 is about 8371.9568202422. The cubic root of 70089661 is about 412.3044161260.

The spelling of 70089661 in words is "seventy million, eighty-nine thousand, six hundred sixty-one".