84851639531 has 4 divisors (see below), whose sum is σ = 84991428672. Its totient is φ = 84711850392.

The previous prime is 84851639519. The next prime is 84851639567. The reversal of 84851639531 is 13593615848.

It is a happy number.

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 84851639531 - 2¹⁰ = 84851638507 is a prime.

It is a super-2 number, since 2×84851639531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84851630531) 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, 69893660 + ... + 69894873.

It is an arithmetic number, because the mean of its divisors is an integer number (21247857168).

Almost surely, 2^84851639531 is an apocalyptic number.

84851639531 is a deficient number, since it is larger than the sum of its proper divisors (139789141).

84851639531 is a wasteful number, since it uses less digits than its factorization.

84851639531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139789140.

The product of its digits is 3110400, while the sum is 53.

The spelling of 84851639531 in words is "eighty-four billion, eight hundred fifty-one million, six hundred thirty-nine thousand, five hundred thirty-one".