1921906071 has 12 divisors (see below), whose sum is σ = 2776918248. Its totient is φ = 1280886864.

The previous prime is 1921906057. The next prime is 1921906121. The reversal of 1921906071 is 1706091291.

It is a de Polignac number, because none of the positive numbers 2^k-1921906071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921906001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1576 + ... + 62018.

It is an arithmetic number, because the mean of its divisors is an integer number (231409854).

Almost surely, 2^1921906071 is an apocalyptic number.

1921906071 is a deficient number, since it is larger than the sum of its proper divisors (855012177).

1921906071 is a wasteful number, since it uses less digits than its factorization.

1921906071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63982 (or 63979 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 1921906071 is about 43839.5491651089. The cubic root of 1921906071 is about 1243.3041584212.

The spelling of 1921906071 in words is "one billion, nine hundred twenty-one million, nine hundred six thousand, seventy-one".