1021826109 has 4 divisors (see below), whose sum is σ = 1362434816. Its totient is φ = 681217404.

The previous prime is 1021826063. The next prime is 1021826159. The reversal of 1021826109 is 9016281201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9016281201 = 3 ⋅3005427067.

It is not a de Polignac number, because 1021826109 - 2¹² = 1021822013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021826159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170304349 + ... + 170304354.

It is an arithmetic number, because the mean of its divisors is an integer number (340608704).

Almost surely, 2^1021826109 is an apocalyptic number.

It is an amenable number.

1021826109 is a deficient number, since it is larger than the sum of its proper divisors (340608707).

1021826109 is an equidigital number, since it uses as much as digits as its factorization.

1021826109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340608706.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1021826109 is about 31966.0149064596. The cubic root of 1021826109 is about 1007.2230712919.

The spelling of 1021826109 in words is "one billion, twenty-one million, eight hundred twenty-six thousand, one hundred nine".