1921629793 has 2 divisors, whose sum is σ = 1921629794. Its totient is φ = 1921629792.

The previous prime is 1921629791. The next prime is 1921629797. The reversal of 1921629793 is 3979261291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310946849 + 610682944 = 36207^2 + 24712^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921629793 - 2¹ = 1921629791 is a prime.

It is a super-2 number, since 2×1921629793² = 7385322122690445698, which contains 22 as substring.

Together with 1921629791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1921629791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960814896 + 960814897.

It is an arithmetic number, because the mean of its divisors is an integer number (960814897).

Almost surely, 2^1921629793 is an apocalyptic number.

It is an amenable number.

1921629793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921629793 is an equidigital number, since it uses as much as digits as its factorization.

1921629793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 1921629793 is about 43836.3980386163. The cubic root of 1921629793 is about 1243.2445797122.

The spelling of 1921629793 in words is "one billion, nine hundred twenty-one million, six hundred twenty-nine thousand, seven hundred ninety-three".