1321901709 has 8 divisors (see below), whose sum is σ = 1767767040. Its totient is φ = 878652096.

The previous prime is 1321901677. The next prime is 1321901719. The reversal of 1321901709 is 9071091231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321901709 - 2⁵ = 1321901677 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321901709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321901719) 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 7 ways as a sum of consecutive naturals, for example, 652749 + ... + 654770.

It is an arithmetic number, because the mean of its divisors is an integer number (220970880).

Almost surely, 2^1321901709 is an apocalyptic number.

It is an amenable number.

1321901709 is a deficient number, since it is larger than the sum of its proper divisors (445865331).

1321901709 is a wasteful number, since it uses less digits than its factorization.

1321901709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307859.

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

The square root of 1321901709 is about 36357.9662385013. The cubic root of 1321901709 is about 1097.4878509387.

The spelling of 1321901709 in words is "one billion, three hundred twenty-one million, nine hundred one thousand, seven hundred nine".