31141661561 has 16 divisors (see below), whose sum is σ = 33591015360. Its totient is φ = 28773803520.

The previous prime is 31141661549. The next prime is 31141661611. The reversal of 31141661561 is 16516614113.

It is a cyclic number.

It is not a de Polignac number, because 31141661561 - 2¹⁸ = 31141399417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31141661261) 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, 4122590 + ... + 4130136.

It is an arithmetic number, because the mean of its divisors is an integer number (2099438460).

Almost surely, 2^31141661561 is an apocalyptic number.

It is an amenable number.

31141661561 is a deficient number, since it is larger than the sum of its proper divisors (2449353799).

31141661561 is a wasteful number, since it uses less digits than its factorization.

31141661561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12904.

The product of its digits is 12960, while the sum is 35.

The spelling of 31141661561 in words is "thirty-one billion, one hundred forty-one million, six hundred sixty-one thousand, five hundred sixty-one".