83980649 has 2 divisors, whose sum is σ = 83980650. Its totient is φ = 83980648.

The previous prime is 83980621. The next prime is 83980651. The reversal of 83980649 is 94608938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73222249 + 10758400 = 8557^2 + 3280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83980649 is a prime.

It is a super-2 number, since 2×83980649² = 14105498812922402, which contains 22 as substring.

Together with 83980651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83980609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41990324 + 41990325.

It is an arithmetic number, because the mean of its divisors is an integer number (41990325).

Almost surely, 2^83980649 is an apocalyptic number.

It is an amenable number.

83980649 is a deficient number, since it is larger than the sum of its proper divisors (1).

83980649 is an equidigital number, since it uses as much as digits as its factorization.

83980649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 83980649 is about 9164.0956455070. The cubic root of 83980649 is about 437.9182812176.

The spelling of 83980649 in words is "eighty-three million, nine hundred eighty thousand, six hundred forty-nine".