1954573921 has 4 divisors (see below), whose sum is σ = 1956932500. Its totient is φ = 1952215344.

The previous prime is 1954573891. The next prime is 1954573927. The reversal of 1954573921 is 1293754591.

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 553943296 + 1400630625 = 23536^2 + 37425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954573921 - 2⁹ = 1954573409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1954573927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178046 + ... + 1179703.

It is an arithmetic number, because the mean of its divisors is an integer number (489233125).

Almost surely, 2^1954573921 is an apocalyptic number.

It is an amenable number.

1954573921 is a deficient number, since it is larger than the sum of its proper divisors (2358579).

1954573921 is an equidigital number, since it uses as much as digits as its factorization.

1954573921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358578.

The product of its digits is 340200, while the sum is 46.

The square root of 1954573921 is about 44210.5634549029. The cubic root of 1954573921 is about 1250.3090267423.

The spelling of 1954573921 in words is "one billion, nine hundred fifty-four million, five hundred seventy-three thousand, nine hundred twenty-one".