1641797077 has 2 divisors, whose sum is σ = 1641797078. Its totient is φ = 1641797076.

The previous prime is 1641797023. The next prime is 1641797081. The reversal of 1641797077 is 7707971461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 880368241 + 761428836 = 29671^2 + 27594^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641797077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1641797077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641707077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820898538 + 820898539.

It is an arithmetic number, because the mean of its divisors is an integer number (820898539).

Almost surely, 2^1641797077 is an apocalyptic number.

It is an amenable number.

1641797077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641797077 is an equidigital number, since it uses as much as digits as its factorization.

1641797077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518616, while the sum is 49.

The square root of 1641797077 is about 40519.0952144788. The cubic root of 1641797077 is about 1179.7042917448.

The spelling of 1641797077 in words is "one billion, six hundred forty-one million, seven hundred ninety-seven thousand, seventy-seven".