32731381561 has 16 divisors (see below), whose sum is σ = 34420593600. Its totient is φ = 31098120768.

The previous prime is 32731381499. The next prime is 32731381591. The reversal of 32731381561 is 16518313723.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 32731381561 - 2⁷ = 32731381433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32731381591) 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 15 ways as a sum of consecutive naturals, for example, 131395 + ... + 287623.

It is an arithmetic number, because the mean of its divisors is an integer number (2151287100).

Almost surely, 2^32731381561 is an apocalyptic number.

It is an amenable number.

32731381561 is a deficient number, since it is larger than the sum of its proper divisors (1689212039).

32731381561 is a wasteful number, since it uses less digits than its factorization.

32731381561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156408.

The product of its digits is 90720, while the sum is 40.

The spelling of 32731381561 in words is "thirty-two billion, seven hundred thirty-one million, three hundred eighty-one thousand, five hundred sixty-one".