1921673879 has 2 divisors, whose sum is σ = 1921673880. Its totient is φ = 1921673878.

The previous prime is 1921673839. The next prime is 1921673891. The reversal of 1921673879 is 9783761291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1921673879 - 2¹⁶ = 1921608343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1921673879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921673839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960836939 + 960836940.

It is an arithmetic number, because the mean of its divisors is an integer number (960836940).

Almost surely, 2^1921673879 is an apocalyptic number.

1921673879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921673879 is an equidigital number, since it uses as much as digits as its factorization.

1921673879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 1921673879 is about 43836.9008827038. The cubic root of 1921673879 is about 1243.2540871386.

The spelling of 1921673879 in words is "one billion, nine hundred twenty-one million, six hundred seventy-three thousand, eight hundred seventy-nine".