690986077 has 2 divisors, whose sum is σ = 690986078. Its totient is φ = 690986076.

The previous prime is 690986071. The next prime is 690986081. The reversal of 690986077 is 770689096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 685444761 + 5541316 = 26181^2 + 2354^2 .

It is a cyclic number.

It is not a de Polignac number, because 690986077 - 2²³ = 682597469 is a prime.

It is a super-3 number, since 3×690986077³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690986071) 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, 345493038 + 345493039.

It is an arithmetic number, because the mean of its divisors is an integer number (345493039).

Almost surely, 2^690986077 is an apocalyptic number.

It is an amenable number.

690986077 is a deficient number, since it is larger than the sum of its proper divisors (1).

690986077 is an equidigital number, since it uses as much as digits as its factorization.

690986077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 690986077 is about 26286.6140269149. The cubic root of 690986077 is about 884.0763350917.

The spelling of 690986077 in words is "six hundred ninety million, nine hundred eighty-six thousand, seventy-seven".