7933001981 has 2 divisors, whose sum is σ = 7933001982. Its totient is φ = 7933001980.

The previous prime is 7933001969. The next prime is 7933002067. The reversal of 7933001981 is 1891003397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6698604025 + 1234397956 = 81845^2 + 35134^2 .

It is a cyclic number.

It is not a de Polignac number, because 7933001981 - 2³⁰ = 6859260157 is a prime.

It is a super-2 number, since 2×7933001981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7933051981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3966500990 + 3966500991.

It is an arithmetic number, because the mean of its divisors is an integer number (3966500991).

Almost surely, 2^7933001981 is an apocalyptic number.

It is an amenable number.

7933001981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7933001981 is an equidigital number, since it uses as much as digits as its factorization.

7933001981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 7933001981 is about 89067.4013374141. The cubic root of 7933001981 is about 1994.4011729433.

The spelling of 7933001981 in words is "seven billion, nine hundred thirty-three million, one thousand, nine hundred eighty-one".