79203661 has 2 divisors, whose sum is σ = 79203662. Its totient is φ = 79203660.

The previous prime is 79203659. The next prime is 79203679. The reversal of 79203661 is 16630297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72080100 + 7123561 = 8490^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 79203661 - 2¹ = 79203659 is a prime.

Together with 79203659, 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 (79203361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39601830 + 39601831.

It is an arithmetic number, because the mean of its divisors is an integer number (39601831).

Almost surely, 2^79203661 is an apocalyptic number.

It is an amenable number.

79203661 is a deficient number, since it is larger than the sum of its proper divisors (1).

79203661 is an equidigital number, since it uses as much as digits as its factorization.

79203661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 79203661 is about 8899.6438692793. The cubic root of 79203661 is about 429.4524507102.

The spelling of 79203661 in words is "seventy-nine million, two hundred three thousand, six hundred sixty-one".