1021713909 has 4 divisors (see below), whose sum is σ = 1362285216. Its totient is φ = 681142604.

The previous prime is 1021713907. The next prime is 1021713911. The reversal of 1021713909 is 9093171201.

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.

It is an interprime number because it is at equal distance from previous prime (1021713907) and next prime (1021713911).

It is a cyclic number.

It is not a de Polignac number, because 1021713909 - 2¹ = 1021713907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021713909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021713907) 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, 170285649 + ... + 170285654.

It is an arithmetic number, because the mean of its divisors is an integer number (340571304).

Almost surely, 2^1021713909 is an apocalyptic number.

It is an amenable number.

1021713909 is a deficient number, since it is larger than the sum of its proper divisors (340571307).

1021713909 is an equidigital number, since it uses as much as digits as its factorization.

1021713909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340571306.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 1021713909 is about 31964.2598694229. The cubic root of 1021713909 is about 1007.1862044303.

The spelling of 1021713909 in words is "one billion, twenty-one million, seven hundred thirteen thousand, nine hundred nine".