3509706781 has 12 divisors (see below), whose sum is σ = 4260231072. Its totient is φ = 2877522648.

The previous prime is 3509706779. The next prime is 3509706787. The reversal of 3509706781 is 1876079053.

It is not a de Polignac number, because 3509706781 - 2¹ = 3509706779 is a prime.

It is a super-2 number, since 2×3509706781² = 24636083377194763922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3509706787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1555975 + ... + 1558228.

It is an arithmetic number, because the mean of its divisors is an integer number (355019256).

Almost surely, 2^3509706781 is an apocalyptic number.

It is an amenable number.

3509706781 is a deficient number, since it is larger than the sum of its proper divisors (750524291).

3509706781 is a wasteful number, since it uses less digits than its factorization.

3509706781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114240 (or 3114233 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 3509706781 is about 59242.7783025070. The cubic root of 3509706781 is about 1519.6967858072.

The spelling of 3509706781 in words is "three billion, five hundred nine million, seven hundred six thousand, seven hundred eighty-one".