82980421 has 2 divisors, whose sum is σ = 82980422. Its totient is φ = 82980420.

The previous prime is 82980419. The next prime is 82980431. The reversal of 82980421 is 12408928.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81703521 + 1276900 = 9039^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 82980421 - 2¹ = 82980419 is a prime.

Together with 82980419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82980431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41490210 + 41490211.

It is an arithmetic number, because the mean of its divisors is an integer number (41490211).

Almost surely, 2^82980421 is an apocalyptic number.

It is an amenable number.

82980421 is a deficient number, since it is larger than the sum of its proper divisors (1).

82980421 is an equidigital number, since it uses as much as digits as its factorization.

82980421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 82980421 is about 9109.3589785451. The cubic root of 82980421 is about 436.1727652587.

The spelling of 82980421 in words is "eighty-two million, nine hundred eighty thousand, four hundred twenty-one".