1921098073 has 8 divisors (see below), whose sum is σ = 2054245320. Its totient is φ = 1790188800.

The previous prime is 1921098059. The next prime is 1921098089. The reversal of 1921098073 is 3708901291.

It can be written as a sum of positive squares in 4 ways, for example, as 524730649 + 1396367424 = 22907^2 + 37368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1921098073 - 2²¹ = 1919000921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1921098043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557718 + ... + 561151.

It is an arithmetic number, because the mean of its divisors is an integer number (256780665).

Almost surely, 2^1921098073 is an apocalyptic number.

It is an amenable number.

1921098073 is a deficient number, since it is larger than the sum of its proper divisors (133147247).

1921098073 is a wasteful number, since it uses less digits than its factorization.

1921098073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118987.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1921098073 is about 43830.3327959074. The cubic root of 1921098073 is about 1243.1298994563.

The spelling of 1921098073 in words is "one billion, nine hundred twenty-one million, ninety-eight thousand, seventy-three".