840870561531 has 32 divisors (see below), whose sum is σ = 1505334716928. Its totient is φ = 403214653440.

The previous prime is 840870561497. The next prime is 840870561533. The reversal of 840870561531 is 135165078048.

It is not a de Polignac number, because 840870561531 - 2¹⁴ = 840870545147 is a prime.

It is a super-2 number, since 2×840870561531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (840870561533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140002086 + ... + 140008091.

It is an arithmetic number, because the mean of its divisors is an integer number (47041709904).

Almost surely, 2^840870561531 is an apocalyptic number.

840870561531 is a deficient number, since it is larger than the sum of its proper divisors (664464155397).

840870561531 is a wasteful number, since it uses less digits than its factorization.

840870561531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280010211.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 840870561531 in words is "eight hundred forty billion, eight hundred seventy million, five hundred sixty-one thousand, five hundred thirty-one".