1909091929 has 4 divisors (see below), whose sum is σ = 1940388580. Its totient is φ = 1877795280.

The previous prime is 1909091927. The next prime is 1909091939. The reversal of 1909091929 is 9291909091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9291909091 = 557 ⋅16682063.

It can be written as a sum of positive squares in 2 ways, for example, as 244859904 + 1664232025 = 15648^2 + 40795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909091929 - 2¹ = 1909091927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1909091927) 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 3 ways as a sum of consecutive naturals, for example, 15648234 + ... + 15648355.

It is an arithmetic number, because the mean of its divisors is an integer number (485097145).

Almost surely, 2^1909091929 is an apocalyptic number.

It is an amenable number.

1909091929 is a deficient number, since it is larger than the sum of its proper divisors (31296651).

1909091929 is an equidigital number, since it uses as much as digits as its factorization.

1909091929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31296650.

The product of its (nonzero) digits is 118098, while the sum is 49.

The square root of 1909091929 is about 43693.1565465348. The cubic root of 1909091929 is about 1240.5347868839.

The spelling of 1909091929 in words is "one billion, nine hundred nine million, ninety-one thousand, nine hundred twenty-nine".