1971441538 has 8 divisors (see below), whose sum is σ = 3225995280. Its totient is φ = 896109780.

The previous prime is 1971441529. The next prime is 1971441541. The reversal of 1971441538 is 8351441791.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1971441494 and 1971441503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44805468 + ... + 44805511.

It is an arithmetic number, because the mean of its divisors is an integer number (403249410).

Almost surely, 2^1971441538 is an apocalyptic number.

1971441538 is a deficient number, since it is larger than the sum of its proper divisors (1254553742).

1971441538 is a wasteful number, since it uses less digits than its factorization.

1971441538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89610992.

The product of its digits is 120960, while the sum is 43.

The square root of 1971441538 is about 44400.9182112262. The cubic root of 1971441538 is about 1253.8953763315.

The spelling of 1971441538 in words is "one billion, nine hundred seventy-one million, four hundred forty-one thousand, five hundred thirty-eight".