77341981 has 2 divisors, whose sum is σ = 77341982. Its totient is φ = 77341980.

The previous prime is 77341937. The next prime is 77341991. The reversal of 77341981 is 18914377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 4239481 = 8550^2 + 2059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77341981 is a prime.

It is a super-2 number, since 2×77341981² = 11963564050008722, 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 (77341921) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38670990 + 38670991.

It is an arithmetic number, because the mean of its divisors is an integer number (38670991).

Almost surely, 2^77341981 is an apocalyptic number.

It is an amenable number.

77341981 is a deficient number, since it is larger than the sum of its proper divisors (1).

77341981 is an equidigital number, since it uses as much as digits as its factorization.

77341981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 77341981 is about 8794.4289752092. The cubic root of 77341981 is about 426.0609818877.

The spelling of 77341981 in words is "seventy-seven million, three hundred forty-one thousand, nine hundred eighty-one".