2071118981 has 4 divisors (see below), whose sum is σ = 2071212000. Its totient is φ = 2071025964.

The previous prime is 2071118971. The next prime is 2071118999. The reversal of 2071118981 is 1898111702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2071118981 is a prime.

It is a super-2 number, since 2×2071118981² = 8579067666916956722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2071118971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8870 + ... + 64968.

It is an arithmetic number, because the mean of its divisors is an integer number (517803000).

Almost surely, 2^2071118981 is an apocalyptic number.

It is an amenable number.

2071118981 is a deficient number, since it is larger than the sum of its proper divisors (93019).

2071118981 is an equidigital number, since it uses as much as digits as its factorization.

2071118981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93018.

The product of its (nonzero) digits is 8064, while the sum is 38.

The square root of 2071118981 is about 45509.5482399024. The cubic root of 2071118981 is about 1274.6815005546.

The spelling of 2071118981 in words is "two billion, seventy-one million, one hundred eighteen thousand, nine hundred eighty-one".