1954669819 has 4 divisors (see below), whose sum is σ = 1971967896. Its totient is φ = 1937371744.

The previous prime is 1954669813. The next prime is 1954669883. The reversal of 1954669819 is 9189664591.

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

It is a cyclic number.

It is not a de Polignac number, because 1954669819 - 2³ = 1954669811 is a prime.

It is a super-2 number, since 2×1954669819² = 7641468202618985522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1954669811) 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, 8648869 + ... + 8649094.

It is an arithmetic number, because the mean of its divisors is an integer number (492991974).

Almost surely, 2^1954669819 is an apocalyptic number.

1954669819 is a deficient number, since it is larger than the sum of its proper divisors (17298077).

1954669819 is a wasteful number, since it uses less digits than its factorization.

1954669819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17298076.

The product of its digits is 4199040, while the sum is 58.

The square root of 1954669819 is about 44211.6480014034. The cubic root of 1954669819 is about 1250.3294745363.

The spelling of 1954669819 in words is "one billion, nine hundred fifty-four million, six hundred sixty-nine thousand, eight hundred nineteen".