978772693 has 2 divisors, whose sum is σ = 978772694. Its totient is φ = 978772692.

The previous prime is 978772643. The next prime is 978772699. The reversal of 978772693 is 396277879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 709583044 + 269189649 = 26638^2 + 16407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978772693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978772699) 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, 489386346 + 489386347.

It is an arithmetic number, because the mean of its divisors is an integer number (489386347).

Almost surely, 2^978772693 is an apocalyptic number.

It is an amenable number.

978772693 is a deficient number, since it is larger than the sum of its proper divisors (1).

978772693 is an equidigital number, since it uses as much as digits as its factorization.

978772693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8001504, while the sum is 58.

The square root of 978772693 is about 31285.3431018424. The cubic root of 978772693 is about 992.8735655736.

The spelling of 978772693 in words is "nine hundred seventy-eight million, seven hundred seventy-two thousand, six hundred ninety-three".