1609099861009 has 9 divisors (see below), whose sum is σ = 1629827543547. Its totient is φ = 1588632565104.

The previous prime is 1609099860923. The next prime is 1609099861037. The reversal of 1609099861009 is 9001689909061.

The square root of 1609099861009 is 1268503.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 735383427025 + 873716433984 = 857545^2 + 934728^2 .

It is not a de Polignac number, because 1609099861009 - 2²¹ = 1609097763857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1609099861099) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 100203709 + ... + 100219765.

It is an arithmetic number, because the mean of its divisors is an integer number (181091949283).

Almost surely, 2^{1609099861009} is an apocalyptic number.

1609099861009 is the 1268503-rd square number.

1609099861009 is the 634252-nd centered octagonal number.

It is an amenable number.

1609099861009 is a deficient number, since it is larger than the sum of its proper divisors (20727682538).

1609099861009 is an frugal number, since it uses more digits than its factorization.

1609099861009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32272 (or 16136 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 58.

The spelling of 1609099861009 in words is "one trillion, six hundred nine billion, ninety-nine million, eight hundred sixty-one thousand, nine".