82345621 has 2 divisors, whose sum is σ = 82345622. Its totient is φ = 82345620.

The previous prime is 82345619. The next prime is 82345633. The reversal of 82345621 is 12654328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82174225 + 171396 = 9065^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 82345621 - 2¹ = 82345619 is a prime.

Together with 82345619, 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 (82345661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41172810 + 41172811.

It is an arithmetic number, because the mean of its divisors is an integer number (41172811).

Almost surely, 2^82345621 is an apocalyptic number.

It is an amenable number.

82345621 is a deficient number, since it is larger than the sum of its proper divisors (1).

82345621 is an equidigital number, since it uses as much as digits as its factorization.

82345621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 82345621 is about 9074.4487986874. The cubic root of 82345621 is about 435.0576767668.

Adding to 82345621 its reverse (12654328), we get a palindrome (94999949).

The spelling of 82345621 in words is "eighty-two million, three hundred forty-five thousand, six hundred twenty-one".