1021741993 has 4 divisors (see below), whose sum is σ = 1021945428. Its totient is φ = 1021538560.

The previous prime is 1021741991. The next prime is 1021742039. The reversal of 1021741993 is 3991471201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 893531664 + 128210329 = 29892^2 + 11323^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021741993 - 2¹ = 1021741991 is a prime.

It is a super-2 number, since 2×1021741993² = 2087913400519224098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021741991) 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 in 3 ways as a sum of consecutive naturals, for example, 93988 + ... + 104293.

It is an arithmetic number, because the mean of its divisors is an integer number (255486357).

Almost surely, 2^1021741993 is an apocalyptic number.

It is an amenable number.

1021741993 is a deficient number, since it is larger than the sum of its proper divisors (203435).

1021741993 is an equidigital number, since it uses as much as digits as its factorization.

1021741993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203434.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1021741993 is about 31964.6991695527. The cubic root of 1021741993 is about 1007.1954325707.

The spelling of 1021741993 in words is "one billion, twenty-one million, seven hundred forty-one thousand, nine hundred ninety-three".