84612131 has 4 divisors (see below), whose sum is σ = 85433712. Its totient is φ = 83790552.

The previous prime is 84612127. The next prime is 84612181. The reversal of 84612131 is 13121648.

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 84612131 - 2² = 84612127 is a prime.

It is a super-2 number, since 2×84612131² = 14318425424722322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84612131.

It is not an unprimeable number, because it can be changed into a prime (84612181) 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, 410636 + ... + 410841.

It is an arithmetic number, because the mean of its divisors is an integer number (21358428).

Almost surely, 2^84612131 is an apocalyptic number.

84612131 is a deficient number, since it is larger than the sum of its proper divisors (821581).

84612131 is a wasteful number, since it uses less digits than its factorization.

84612131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821580.

The product of its digits is 1152, while the sum is 26.

The square root of 84612131 is about 9198.4852557364. The cubic root of 84612131 is about 439.0131654425.

Adding to 84612131 its reverse (13121648), we get a palindrome (97733779).

The spelling of 84612131 in words is "eighty-four million, six hundred twelve thousand, one hundred thirty-one".