797195981 has 2 divisors, whose sum is σ = 797195982. Its totient is φ = 797195980.

The previous prime is 797195951. The next prime is 797196047. The reversal of 797195981 is 189591797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 429898756 + 367297225 = 20734^2 + 19165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-797195981 is a prime.

It is a super-2 number, since 2×797195981² = 1271042864245104722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (797195951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398597990 + 398597991.

It is an arithmetic number, because the mean of its divisors is an integer number (398597991).

Almost surely, 2^797195981 is an apocalyptic number.

It is an amenable number.

797195981 is a deficient number, since it is larger than the sum of its proper divisors (1).

797195981 is an equidigital number, since it uses as much as digits as its factorization.

797195981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 56.

The square root of 797195981 is about 28234.6592152269. The cubic root of 797195981 is about 927.2319051358.

The spelling of 797195981 in words is "seven hundred ninety-seven million, one hundred ninety-five thousand, nine hundred eighty-one".