78554969 has 2 divisors, whose sum is σ = 78554970. Its totient is φ = 78554968.

The previous prime is 78554947. The next prime is 78554989. The reversal of 78554969 is 96945587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78092569 + 462400 = 8837^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 78554969 - 2¹² = 78550873 is a prime.

It is a super-2 number, since 2×78554969² = 12341766309181922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78554969.

It is not a weakly prime, because it can be changed into another prime (78554929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39277484 + 39277485.

It is an arithmetic number, because the mean of its divisors is an integer number (39277485).

Almost surely, 2^78554969 is an apocalyptic number.

It is an amenable number.

78554969 is a deficient number, since it is larger than the sum of its proper divisors (1).

78554969 is an equidigital number, since it uses as much as digits as its factorization.

78554969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 53.

The square root of 78554969 is about 8863.1241106057. The cubic root of 78554969 is about 428.2768047384.

The spelling of 78554969 in words is "seventy-eight million, five hundred fifty-four thousand, nine hundred sixty-nine".