8001900981 has 10 divisors (see below), whose sum is σ = 11953457142. Its totient is φ = 5334600600.

The previous prime is 8001900937. The next prime is 8001901007. The reversal of 8001900981 is 1890091008.

It can be written as a sum of positive squares in only one way, i.e., 4257562500 + 3744338481 = 65250^2 + 61191^2 .

It is not a de Polignac number, because 8001900981 - 2⁹ = 8001900469 is a prime.

It is a super-2 number, since 2×8001900981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8001970981) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 49394370 + ... + 49394531.

Almost surely, 2^8001900981 is an apocalyptic number.

8001900981 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8001900981 is a deficient number, since it is larger than the sum of its proper divisors (3951556161).

8001900981 is an equidigital number, since it uses as much as digits as its factorization.

8001900981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98788913 (or 98788904 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 8001900981 is about 89453.3452756240. The cubic root of 8001900981 is about 2000.1584025373.

Adding to 8001900981 its reverse (1890091008), we get a palindrome (9891991989).

The spelling of 8001900981 in words is "eight billion, one million, nine hundred thousand, nine hundred eighty-one".