1231799409 has 9 divisors (see below), whose sum is σ = 1779417913. Its totient is φ = 821129412.

The previous prime is 1231799407. The next prime is 1231799461. The reversal of 1231799409 is 9049971321.

The square root of 1231799409 is 35097.

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

1231799409 is a `hidden beast` number, since 1 + 231 + 7 + 9 + 9 + 409 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1231799409 - 2¹ = 1231799407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231799407) 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, 99442 + ... + 111140.

Almost surely, 2^1231799409 is an apocalyptic number.

1231799409 is the 35097-th square number.

1231799409 is the 17549-th centered octagonal number.

It is an amenable number.

1231799409 is a deficient number, since it is larger than the sum of its proper divisors (547618504).

1231799409 is an frugal number, since it uses more digits than its factorization.

1231799409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23404 (or 11702 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The cubic root of 1231799409 is about 1071.9634977848.

The spelling of 1231799409 in words is "one billion, two hundred thirty-one million, seven hundred ninety-nine thousand, four hundred nine".