84213551 has 2 divisors, whose sum is σ = 84213552. Its totient is φ = 84213550.

The previous prime is 84213539. The next prime is 84213581. The reversal of 84213551 is 15531248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84213551 - 2⁶ = 84213487 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84213581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42106775 + 42106776.

It is an arithmetic number, because the mean of its divisors is an integer number (42106776).

Almost surely, 2^84213551 is an apocalyptic number.

84213551 is a deficient number, since it is larger than the sum of its proper divisors (1).

84213551 is an equidigital number, since it uses as much as digits as its factorization.

84213551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 84213551 is about 9176.7941570028. The cubic root of 84213551 is about 438.3227311534.

Adding to 84213551 its reverse (15531248), we get a palindrome (99744799).

The spelling of 84213551 in words is "eighty-four million, two hundred thirteen thousand, five hundred fifty-one".