7952755981 has 2 divisors, whose sum is σ = 7952755982. Its totient is φ = 7952755980.

The previous prime is 7952755871. The next prime is 7952755997. The reversal of 7952755981 is 1895572597.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6377459881 + 1575296100 = 79859^2 + 39690^2 .

It is an emirp because it is prime and its reverse (1895572597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7952755981 - 2¹⁵ = 7952723213 is a prime.

It is a super-2 number, since 2×7952755981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7952759981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3976377990 + 3976377991.

It is an arithmetic number, because the mean of its divisors is an integer number (3976377991).

Almost surely, 2^7952755981 is an apocalyptic number.

It is an amenable number.

7952755981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7952755981 is an equidigital number, since it uses as much as digits as its factorization.

7952755981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938000, while the sum is 58.

The square root of 7952755981 is about 89178.2259354827. The cubic root of 7952755981 is about 1996.0552228990.

The spelling of 7952755981 in words is "seven billion, nine hundred fifty-two million, seven hundred fifty-five thousand, nine hundred eighty-one".