1930053921 has 4 divisors (see below), whose sum is σ = 2573405232. Its totient is φ = 1286702612.

The previous prime is 1930053841. The next prime is 1930053941. The reversal of 1930053921 is 1293500391.

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.

It is a cyclic number.

It is not a de Polignac number, because 1930053921 - 2⁷ = 1930053793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1930053941) 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, 321675651 + ... + 321675656.

It is an arithmetic number, because the mean of its divisors is an integer number (643351308).

Almost surely, 2^1930053921 is an apocalyptic number.

It is an amenable number.

1930053921 is a deficient number, since it is larger than the sum of its proper divisors (643351311).

1930053921 is an equidigital number, since it uses as much as digits as its factorization.

1930053921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643351310.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 1930053921 is about 43932.3789590320. The cubic root of 1930053921 is about 1245.0586620962.

The spelling of 1930053921 in words is "one billion, nine hundred thirty million, fifty-three thousand, nine hundred twenty-one".