84121139 has 2 divisors, whose sum is σ = 84121140. Its totient is φ = 84121138.

The previous prime is 84121133. The next prime is 84121157. The reversal of 84121139 is 93112148.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84121139 is a prime.

It is not a weakly prime, because it can be changed into another prime (84121133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42060569 + 42060570.

It is an arithmetic number, because the mean of its divisors is an integer number (42060570).

Almost surely, 2^84121139 is an apocalyptic number.

84121139 is a deficient number, since it is larger than the sum of its proper divisors (1).

84121139 is an equidigital number, since it uses as much as digits as its factorization.

84121139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 84121139 is about 9171.7576832361. The cubic root of 84121139 is about 438.1623408704.

The spelling of 84121139 in words is "eighty-four million, one hundred twenty-one thousand, one hundred thirty-nine".