31321561065 has 16 divisors (see below), whose sum is σ = 50275645056. Its totient is φ = 16651116800.

The previous prime is 31321561057. The next prime is 31321561067. The reversal of 31321561065 is 56016512313.

It is not a de Polignac number, because 31321561065 - 2³ = 31321561057 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31321561067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3352416 + ... + 3361745.

It is an arithmetic number, because the mean of its divisors is an integer number (3142227816).

Almost surely, 2^31321561065 is an apocalyptic number.

It is an amenable number.

31321561065 is a deficient number, since it is larger than the sum of its proper divisors (18954083991).

31321561065 is a wasteful number, since it uses less digits than its factorization.

31321561065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6714480.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 31321561065 in words is "thirty-one billion, three hundred twenty-one million, five hundred sixty-one thousand, sixty-five".