1999054669 has 4 divisors (see below), whose sum is σ = 1999198944. Its totient is φ = 1998910396.

The previous prime is 1999054621. The next prime is 1999054691. The reversal of 1999054669 is 9664509991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9664509991 = 1801 ⋅5366191.

It is a cyclic number.

It is not a de Polignac number, because 1999054669 - 2¹³ = 1999046477 is a prime.

It is a super-2 number, since 2×1999054669² = 7992439139301399122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999024669) 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, 48847 + ... + 79900.

It is an arithmetic number, because the mean of its divisors is an integer number (499799736).

Almost surely, 2^1999054669 is an apocalyptic number.

It is an amenable number.

1999054669 is a deficient number, since it is larger than the sum of its proper divisors (144275).

1999054669 is a wasteful number, since it uses less digits than its factorization.

1999054669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144274.

The product of its (nonzero) digits is 4723920, while the sum is 58.

The square root of 1999054669 is about 44710.7891788995. The cubic root of 1999054669 is about 1259.7225115398.

The spelling of 1999054669 in words is "one billion, nine hundred ninety-nine million, fifty-four thousand, six hundred sixty-nine".