78562961 has 2 divisors, whose sum is σ = 78562962. Its totient is φ = 78562960.

The previous prime is 78562909. The next prime is 78562987. The reversal of 78562961 is 16926587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54982225 + 23580736 = 7415^2 + 4856^2 .

It is a cyclic number.

It is not a de Polignac number, because 78562961 - 2¹⁰ = 78561937 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78592961) 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, 39281480 + 39281481.

It is an arithmetic number, because the mean of its divisors is an integer number (39281481).

Almost surely, 2^78562961 is an apocalyptic number.

It is an amenable number.

78562961 is a deficient number, since it is larger than the sum of its proper divisors (1).

78562961 is an equidigital number, since it uses as much as digits as its factorization.

78562961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 78562961 is about 8863.5749559644. The cubic root of 78562961 is about 428.2913282082.

The spelling of 78562961 in words is "seventy-eight million, five hundred sixty-two thousand, nine hundred sixty-one".