1969027661 has 2 divisors, whose sum is σ = 1969027662. Its totient is φ = 1969027660.

The previous prime is 1969027657. The next prime is 1969027667. The reversal of 1969027661 is 1667209691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1721752036 + 247275625 = 41494^2 + 15725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1969027661 - 2² = 1969027657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1969027667) 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, 984513830 + 984513831.

It is an arithmetic number, because the mean of its divisors is an integer number (984513831).

Almost surely, 2^1969027661 is an apocalyptic number.

It is an amenable number.

1969027661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969027661 is an equidigital number, since it uses as much as digits as its factorization.

1969027661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 1969027661 is about 44373.7271479419. The cubic root of 1969027661 is about 1253.3834014928.

The spelling of 1969027661 in words is "one billion, nine hundred sixty-nine million, twenty-seven thousand, six hundred sixty-one".