1229511109 has 4 divisors (see below), whose sum is σ = 1294222240. Its totient is φ = 1164799980.

The previous prime is 1229511079. The next prime is 1229511113. The reversal of 1229511109 is 9011159221.

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 a cyclic number.

It is not a de Polignac number, because 1229511109 - 2¹⁹ = 1228986821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229511139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32355537 + ... + 32355574.

It is an arithmetic number, because the mean of its divisors is an integer number (323555560).

Almost surely, 2^1229511109 is an apocalyptic number.

1229511109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1229511109 is a deficient number, since it is larger than the sum of its proper divisors (64711131).

1229511109 is an equidigital number, since it uses as much as digits as its factorization.

1229511109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64711130.

The product of its (nonzero) digits is 1620, while the sum is 31.

The square root of 1229511109 is about 35064.3851935265. The cubic root of 1229511109 is about 1071.2992947829.

The spelling of 1229511109 in words is "one billion, two hundred twenty-nine million, five hundred eleven thousand, one hundred nine".