1981901712 has 80 divisors (see below), whose sum is σ = 5947313792. Its totient is φ = 556968960.

The previous prime is 1981901699. The next prime is 1981901717. The reversal of 1981901712 is 2171091891.

It is not an unprimeable number, because it can be changed into a prime (1981901717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27853 + ... + 68844.

Almost surely, 2^1981901712 is an apocalyptic number.

1981901712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1981901712 is an abundant number, since it is smaller than the sum of its proper divisors (3965412080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981901712 is a wasteful number, since it uses less digits than its factorization.

1981901712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96776 (or 96770 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 39.

The square root of 1981901712 is about 44518.5546935208. The cubic root of 1981901712 is about 1256.1091261155.

The spelling of 1981901712 in words is "one billion, nine hundred eighty-one million, nine hundred one thousand, seven hundred twelve".