1931868851 has 8 divisors (see below), whose sum is σ = 2108780544. Its totient is φ = 1755171720.

The previous prime is 1931868839. The next prime is 1931868853. The reversal of 1931868851 is 1588681391.

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

It is a cyclic number.

It is not a de Polignac number, because 1931868851 - 2¹⁴ = 1931852467 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 1931868851.

It is not an unprimeable number, because it can be changed into a prime (1931868853) 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 7 ways as a sum of consecutive naturals, for example, 34511 + ... + 71096.

It is an arithmetic number, because the mean of its divisors is an integer number (263597568).

Almost surely, 2^1931868851 is an apocalyptic number.

1931868851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1931868851 is a deficient number, since it is larger than the sum of its proper divisors (176911693).

1931868851 is a wasteful number, since it uses less digits than its factorization.

1931868851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107281.

The product of its digits is 414720, while the sum is 50.

The square root of 1931868851 is about 43953.0300548210. The cubic root of 1931868851 is about 1245.4488042851.

The spelling of 1931868851 in words is "one billion, nine hundred thirty-one million, eight hundred sixty-eight thousand, eight hundred fifty-one".