1909161005 has 16 divisors (see below), whose sum is σ = 2322220800. Its totient is φ = 1506548160.

The previous prime is 1909160971. The next prime is 1909161011. The reversal of 1909161005 is 5001619091.

It is a happy number.

It is not a de Polignac number, because 1909161005 - 2⁸ = 1909160749 is a prime.

It is a super-2 number, since 2×1909161005² = 7289791486025220050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622175 + ... + 625235.

It is an arithmetic number, because the mean of its divisors is an integer number (145138800).

Almost surely, 2^1909161005 is an apocalyptic number.

It is an amenable number.

1909161005 is a deficient number, since it is larger than the sum of its proper divisors (413059795).

1909161005 is a wasteful number, since it uses less digits than its factorization.

1909161005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4724.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 1909161005 is about 43693.9470064218. The cubic root of 1909161005 is about 1240.5497486477.

The spelling of 1909161005 in words is "one billion, nine hundred nine million, one hundred sixty-one thousand, five".