31541791281985 has 16 divisors (see below), whose sum is σ = 37941386985216. Its totient is φ = 25172637090048.

The previous prime is 31541791281971. The next prime is 31541791282031. The reversal of 31541791281985 is 58918219714513.

It is a cyclic number.

It is not a de Polignac number, because 31541791281985 - 2¹¹ = 31541791279937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6890329 + ... + 10514761.

It is an arithmetic number, because the mean of its divisors is an integer number (2371336686576).

Almost surely, 2^{31541791281985} is an apocalyptic number.

It is an amenable number.

31541791281985 is a deficient number, since it is larger than the sum of its proper divisors (6399595703231).

31541791281985 is a wasteful number, since it uses less digits than its factorization.

31541791281985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628632.

The product of its digits is 21772800, while the sum is 64.

The spelling of 31541791281985 in words is "thirty-one trillion, five hundred forty-one billion, seven hundred ninety-one million, two hundred eighty-one thousand, nine hundred eighty-five".