7951843981 has 16 divisors (see below), whose sum is σ = 8427460608. Its totient is φ = 7487884800.

The previous prime is 7951843979. The next prime is 7951844023. The reversal of 7951843981 is 1893481597.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7951843981 - 2¹ = 7951843979 is a prime.

It is a super-2 number, since 2×7951843981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7951843931) 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 15 ways as a sum of consecutive naturals, for example, 416791 + ... + 435451.

It is an arithmetic number, because the mean of its divisors is an integer number (526716288).

Almost surely, 2^7951843981 is an apocalyptic number.

It is an amenable number.

7951843981 is a deficient number, since it is larger than the sum of its proper divisors (475616627).

7951843981 is a wasteful number, since it uses less digits than its factorization.

7951843981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18972.

The product of its digits is 2177280, while the sum is 55.

The square root of 7951843981 is about 89173.1124330647. The cubic root of 7951843981 is about 1995.9789192897.

The spelling of 7951843981 in words is "seven billion, nine hundred fifty-one million, eight hundred forty-three thousand, nine hundred eighty-one".