1019978077 has 2 divisors, whose sum is σ = 1019978078. Its totient is φ = 1019978076.

The previous prime is 1019978041. The next prime is 1019978101. The reversal of 1019978077 is 7708799101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540981081 + 478996996 = 23259^2 + 21886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1019978077 - 2¹¹ = 1019976029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1019978077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019978777) 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, 509989038 + 509989039.

It is an arithmetic number, because the mean of its divisors is an integer number (509989039).

Almost surely, 2^1019978077 is an apocalyptic number.

It is an amenable number.

1019978077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019978077 is an equidigital number, since it uses as much as digits as its factorization.

1019978077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 49.

The square root of 1019978077 is about 31937.0956256201. The cubic root of 1019978077 is about 1006.6154976818.

The spelling of 1019978077 in words is "one billion, nineteen million, nine hundred seventy-eight thousand, seventy-seven".