1209909899375 has 40 divisors (see below), whose sum is σ = 1518185462640. Its totient is φ = 963914688000.

The previous prime is 1209909899281. The next prime is 1209909899381. The reversal of 1209909899375 is 5739989099021.

It is not a de Polignac number, because 1209909899375 - 2¹² = 1209909895279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1209909899299 and 1209909899308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 160525607 + ... + 160533143.

It is an arithmetic number, because the mean of its divisors is an integer number (37954636566).

Almost surely, 2^{1209909899375} is an apocalyptic number.

1209909899375 is a deficient number, since it is larger than the sum of its proper divisors (308275563265).

1209909899375 is an frugal number, since it uses more digits than its factorization.

1209909899375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8589 (or 8574 counting only the distinct ones).

The product of its (nonzero) digits is 99202320, while the sum is 71.

The spelling of 1209909899375 in words is "one trillion, two hundred nine billion, nine hundred nine million, eight hundred ninety-nine thousand, three hundred seventy-five".