921729619 has 2 divisors, whose sum is σ = 921729620. Its totient is φ = 921729618.

The previous prime is 921729563. The next prime is 921729637. The reversal of 921729619 is 916927129.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 921729619 - 2¹⁷ = 921598547 is a prime.

It is a super-2 number, since 2×921729619² = 1699170981083770322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (921729689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460864809 + 460864810.

It is an arithmetic number, because the mean of its divisors is an integer number (460864810).

Almost surely, 2^921729619 is an apocalyptic number.

921729619 is a deficient number, since it is larger than the sum of its proper divisors (1).

921729619 is an equidigital number, since it uses as much as digits as its factorization.

921729619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 921729619 is about 30360.0003129117. Note that the first 3 decimals coincide. The cubic root of 921729619 is about 973.1979403556.

The spelling of 921729619 in words is "nine hundred twenty-one million, seven hundred twenty-nine thousand, six hundred nineteen".