31431165186161 has 16 divisors (see below), whose sum is σ = 33912396385728. Its totient is φ = 28959040555200.

The previous prime is 31431165186151. The next prime is 31431165186227. The reversal of 31431165186161 is 16168156113413.

It is a cyclic number.

It is not a de Polignac number, because 31431165186161 - 2¹⁰ = 31431165185137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31431165186151) 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, 16940246 + ... + 18703856.

It is an arithmetic number, because the mean of its divisors is an integer number (2119524774108).

Almost surely, 2^{31431165186161} is an apocalyptic number.

It is an amenable number.

31431165186161 is a deficient number, since it is larger than the sum of its proper divisors (2481231199567).

31431165186161 is a wasteful number, since it uses less digits than its factorization.

31431165186161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766192.

The product of its digits is 311040, while the sum is 47.

The spelling of 31431165186161 in words is "thirty-one trillion, four hundred thirty-one billion, one hundred sixty-five million, one hundred eighty-six thousand, one hundred sixty-one".