83707621 has 2 divisors, whose sum is σ = 83707622. Its totient is φ = 83707620.

The previous prime is 83707619. The next prime is 83707661. The reversal of 83707621 is 12670738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82628100 + 1079521 = 9090^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 83707621 - 2¹ = 83707619 is a prime.

Together with 83707619, 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 (83707661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41853810 + 41853811.

It is an arithmetic number, because the mean of its divisors is an integer number (41853811).

Almost surely, 2^83707621 is an apocalyptic number.

It is an amenable number.

83707621 is a deficient number, since it is larger than the sum of its proper divisors (1).

83707621 is an equidigital number, since it uses as much as digits as its factorization.

83707621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 83707621 is about 9149.1869037636. The cubic root of 83707621 is about 437.4431965435.

The spelling of 83707621 in words is "eighty-three million, seven hundred seven thousand, six hundred twenty-one".