84406912731 has 10 divisors (see below), whose sum is σ = 126089338892. Its totient is φ = 56271275100.

The previous prime is 84406912717. The next prime is 84406912739. The reversal of 84406912731 is 13721960448.

It is not a de Polignac number, because 84406912731 - 2⁵ = 84406912699 is a prime.

It is a super-2 number, since 2×84406912731² (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 (84406912739) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 521030245 + ... + 521030406.

Almost surely, 2^84406912731 is an apocalyptic number.

84406912731 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

84406912731 is a deficient number, since it is larger than the sum of its proper divisors (41682426161).

84406912731 is a wasteful number, since it uses less digits than its factorization.

84406912731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042060663 (or 1042060654 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 84406912731 in words is "eighty-four billion, four hundred six million, nine hundred twelve thousand, seven hundred thirty-one".