84205631 has 2 divisors, whose sum is σ = 84205632. Its totient is φ = 84205630.

The previous prime is 84205609. The next prime is 84205633. The reversal of 84205631 is 13650248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84205631 - 2¹⁰ = 84204607 is a prime.

It is a super-2 number, since 2×84205631² = 14181176584216322, which contains 22 as substring.

Together with 84205633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84205594 and 84205603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84205633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42102815 + 42102816.

It is an arithmetic number, because the mean of its divisors is an integer number (42102816).

Almost surely, 2^84205631 is an apocalyptic number.

84205631 is a deficient number, since it is larger than the sum of its proper divisors (1).

84205631 is an equidigital number, since it uses as much as digits as its factorization.

84205631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 84205631 is about 9176.3626236107. The cubic root of 84205631 is about 438.3089897986.

Adding to 84205631 its reverse (13650248), we get a palindrome (97855879).

The spelling of 84205631 in words is "eighty-four million, two hundred five thousand, six hundred thirty-one".