1921025051 has 4 divisors (see below), whose sum is σ = 2095663704. Its totient is φ = 1746386400.

The previous prime is 1921025009. The next prime is 1921025059. The reversal of 1921025051 is 1505201291.

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

It is a de Polignac number, because none of the positive numbers 2^k-1921025051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921025051.

It is not an unprimeable number, because it can be changed into a prime (1921025059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87319310 + ... + 87319331.

It is an arithmetic number, because the mean of its divisors is an integer number (523915926).

Almost surely, 2^1921025051 is an apocalyptic number.

1921025051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1921025051 is a deficient number, since it is larger than the sum of its proper divisors (174638653).

1921025051 is a wasteful number, since it uses less digits than its factorization.

1921025051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174638652.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1921025051 is about 43829.4997803990. The cubic root of 1921025051 is about 1243.1141485718.

The spelling of 1921025051 in words is "one billion, nine hundred twenty-one million, twenty-five thousand, fifty-one".