1954333921 has 32 divisors (see below), whose sum is σ = 2103615360. Its totient is φ = 1813363200.

The previous prime is 1954333903. The next prime is 1954333933. The reversal of 1954333921 is 1293334591.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1954333921 - 2⁷ = 1954333793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1954333321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17929615 + ... + 17929723.

It is an arithmetic number, because the mean of its divisors is an integer number (65737980).

Almost surely, 2^1954333921 is an apocalyptic number.

It is an amenable number.

1954333921 is a deficient number, since it is larger than the sum of its proper divisors (149281439).

1954333921 is a wasteful number, since it uses less digits than its factorization.

1954333921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385.

The product of its digits is 87480, while the sum is 40.

The square root of 1954333921 is about 44207.8490881427. The cubic root of 1954333921 is about 1250.2578499537.

The spelling of 1954333921 in words is "one billion, nine hundred fifty-four million, three hundred thirty-three thousand, nine hundred twenty-one".