1920521079691 has 2 divisors, whose sum is σ = 1920521079692. Its totient is φ = 1920521079690.

The previous prime is 1920521079649. The next prime is 1920521079721. The reversal of 1920521079691 is 1969701250291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1920521079691 - 2³¹ = 1918373596043 is a prime.

It is not a weakly prime, because it can be changed into another prime (1920521079091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960260539845 + 960260539846.

It is an arithmetic number, because the mean of its divisors is an integer number (960260539846).

Almost surely, 2^{1920521079691} is an apocalyptic number.

1920521079691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920521079691 is an equidigital number, since it uses as much as digits as its factorization.

1920521079691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 52.

The spelling of 1920521079691 in words is "one trillion, nine hundred twenty billion, five hundred twenty-one million, seventy-nine thousand, six hundred ninety-one".