83774981 has 2 divisors, whose sum is σ = 83774982. Its totient is φ = 83774980.

The previous prime is 83774941. The next prime is 83774983. The reversal of 83774981 is 18947738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76300225 + 7474756 = 8735^2 + 2734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83774981 is a prime.

It is a super-2 number, since 2×83774981² = 14036494883100722, which contains 22 as substring.

Together with 83774983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83774983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41887490 + 41887491.

It is an arithmetic number, because the mean of its divisors is an integer number (41887491).

Almost surely, 2^83774981 is an apocalyptic number.

It is an amenable number.

83774981 is a deficient number, since it is larger than the sum of its proper divisors (1).

83774981 is an equidigital number, since it uses as much as digits as its factorization.

83774981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 83774981 is about 9152.8673649300. The cubic root of 83774981 is about 437.5605027618.

The spelling of 83774981 in words is "eighty-three million, seven hundred seventy-four thousand, nine hundred eighty-one".