84142131 has 4 divisors (see below), whose sum is σ = 112189512. Its totient is φ = 56094752.

The previous prime is 84142117. The next prime is 84142133. The reversal of 84142131 is 13124148.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84142131 - 2¹¹ = 84140083 is a prime.

It is a super-2 number, since 2×84142131² = 14159796418442322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84142133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14023686 + ... + 14023691.

It is an arithmetic number, because the mean of its divisors is an integer number (28047378).

Almost surely, 2^84142131 is an apocalyptic number.

84142131 is a deficient number, since it is larger than the sum of its proper divisors (28047381).

84142131 is a wasteful number, since it uses less digits than its factorization.

84142131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28047380.

The product of its digits is 768, while the sum is 24.

The square root of 84142131 is about 9172.9019944617. The cubic root of 84142131 is about 438.1987848962.

Adding to 84142131 its reverse (13124148), we get a palindrome (97266279).

The spelling of 84142131 in words is "eighty-four million, one hundred forty-two thousand, one hundred thirty-one".