1904669161 has 4 divisors (see below), whose sum is σ = 1922143300. Its totient is φ = 1887195024.

The previous prime is 1904669149. The next prime is 1904669167. The reversal of 1904669161 is 1619664091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 811110400 + 1093558761 = 28480^2 + 33069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1904669161 - 2¹¹ = 1904667113 is a prime.

It is a super-2 number, since 2×1904669161² = 7255529225728887842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1904669167) 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, 8736906 + ... + 8737123.

It is an arithmetic number, because the mean of its divisors is an integer number (480535825).

Almost surely, 2^1904669161 is an apocalyptic number.

It is an amenable number.

1904669161 is a deficient number, since it is larger than the sum of its proper divisors (17474139).

1904669161 is a wasteful number, since it uses less digits than its factorization.

1904669161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17474138.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 1904669161 is about 43642.5155209917. The cubic root of 1904669161 is about 1239.5760693132.

The spelling of 1904669161 in words is "one billion, nine hundred four million, six hundred sixty-nine thousand, one hundred sixty-one".