1968515671 has 4 divisors (see below), whose sum is σ = 1971706752. Its totient is φ = 1965324592.

The previous prime is 1968515641. The next prime is 1968515687. The reversal of 1968515671 is 1765158691.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1968515671 - 2²³ = 1960127063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968515611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1594615 + ... + 1595848.

It is an arithmetic number, because the mean of its divisors is an integer number (492926688).

Almost surely, 2^1968515671 is an apocalyptic number.

1968515671 is a deficient number, since it is larger than the sum of its proper divisors (3191081).

1968515671 is an equidigital number, since it uses as much as digits as its factorization.

1968515671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191080.

The product of its digits is 453600, while the sum is 49.

The square root of 1968515671 is about 44367.9577059842. The cubic root of 1968515671 is about 1253.2747564310.

The spelling of 1968515671 in words is "one billion, nine hundred sixty-eight million, five hundred fifteen thousand, six hundred seventy-one".