78969017 has 2 divisors, whose sum is σ = 78969018. Its totient is φ = 78969016.

The previous prime is 78968999. The next prime is 78969031. The reversal of 78969017 is 71096987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 28686736 = 7091^2 + 5356^2 .

It is a cyclic number.

It is not a de Polignac number, because 78969017 - 2¹⁶ = 78903481 is a prime.

It is a super-2 number, since 2×78969017² = 12472211291892578, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78989017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39484508 + 39484509.

It is an arithmetic number, because the mean of its divisors is an integer number (39484509).

Almost surely, 2^78969017 is an apocalyptic number.

It is an amenable number.

78969017 is a deficient number, since it is larger than the sum of its proper divisors (1).

78969017 is an equidigital number, since it uses as much as digits as its factorization.

78969017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 78969017 is about 8886.4513164705. The cubic root of 78969017 is about 429.0279412290.

The spelling of 78969017 in words is "seventy-eight million, nine hundred sixty-nine thousand, seventeen".