7690031981 has 2 divisors, whose sum is σ = 7690031982. Its totient is φ = 7690031980.

The previous prime is 7690031959. The next prime is 7690032017. The reversal of 7690031981 is 1891300967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5903617225 + 1786414756 = 76835^2 + 42266^2 .

It is an emirp because it is prime and its reverse (1891300967) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7690031981 is a prime.

It is a super-2 number, since 2×7690031981² (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 (7690031911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3845015990 + 3845015991.

It is an arithmetic number, because the mean of its divisors is an integer number (3845015991).

Almost surely, 2^7690031981 is an apocalyptic number.

It is an amenable number.

7690031981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7690031981 is an equidigital number, since it uses as much as digits as its factorization.

7690031981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 7690031981 is about 87692.8274204909. The cubic root of 7690031981 is about 1973.8283479318.

The spelling of 7690031981 in words is "seven billion, six hundred ninety million, thirty-one thousand, nine hundred eighty-one".