84101391 has 24 divisors (see below), whose sum is σ = 139501440. Its totient is φ = 48286800.

The previous prime is 84101341. The next prime is 84101399. The reversal of 84101391 is 19310148.

It is not a de Polignac number, because 84101391 - 2⁷ = 84101263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84101399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20475 + ... + 24236.

It is an arithmetic number, because the mean of its divisors is an integer number (5812560).

Almost surely, 2^84101391 is an apocalyptic number.

84101391 is a deficient number, since it is larger than the sum of its proper divisors (55400049).

84101391 is a wasteful number, since it uses less digits than its factorization.

84101391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44747 (or 44744 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 84101391 is about 9170.6810543165. The cubic root of 84101391 is about 438.1280510070.

It can be divided in two parts, 8410 and 1391, that added together give a square (9801 = 99²).

The spelling of 84101391 in words is "eighty-four million, one hundred one thousand, three hundred ninety-one".