1954492809 has 16 divisors (see below), whose sum is σ = 2615926080. Its totient is φ = 1298039040.

The previous prime is 1954492807. The next prime is 1954492829. The reversal of 1954492809 is 9082944591.

It is not a de Polignac number, because 1954492809 - 2¹ = 1954492807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1954492801) 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 15 ways as a sum of consecutive naturals, for example, 1178709 + ... + 1180365.

It is an arithmetic number, because the mean of its divisors is an integer number (163495380).

Almost surely, 2^1954492809 is an apocalyptic number.

It is an amenable number.

1954492809 is a deficient number, since it is larger than the sum of its proper divisors (661433271).

1954492809 is a wasteful number, since it uses less digits than its factorization.

1954492809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920.

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 1954492809 is about 44209.6461080611. The cubic root of 1954492809 is about 1250.2917311624.

The spelling of 1954492809 in words is "one billion, nine hundred fifty-four million, four hundred ninety-two thousand, eight hundred nine".