1981863107 has 8 divisors (see below), whose sum is σ = 2287412832. Its totient is φ = 1681920000.

The previous prime is 1981863097. The next prime is 1981863109. The reversal of 1981863107 is 7013681891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1981863107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981863109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1400894 + ... + 1402307.

It is an arithmetic number, because the mean of its divisors is an integer number (285926604).

Almost surely, 2^1981863107 is an apocalyptic number.

1981863107 is a deficient number, since it is larger than the sum of its proper divisors (305549725).

1981863107 is a wasteful number, since it uses less digits than its factorization.

1981863107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803309.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 1981863107 is about 44518.1211081510. The cubic root of 1981863107 is about 1256.1009702439.

The spelling of 1981863107 in words is "one billion, nine hundred eighty-one million, eight hundred sixty-three thousand, one hundred seven".