31356116223161 has 16 divisors (see below), whose sum is σ = 33062223855744. Its totient is φ = 29679956363904.

The previous prime is 31356116223121. The next prime is 31356116223217. The reversal of 31356116223161 is 16132261165313.

It is a cyclic number.

It is not a de Polignac number, because 31356116223161 - 2³⁸ = 31081238316217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31356116223121) 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, 14696975 + ... + 16694708.

It is an arithmetic number, because the mean of its divisors is an integer number (2066388990984).

Almost surely, 2^{31356116223161} is an apocalyptic number.

It is an amenable number.

31356116223161 is a deficient number, since it is larger than the sum of its proper divisors (1706107632583).

31356116223161 is a wasteful number, since it uses less digits than its factorization.

31356116223161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31392160.

The product of its digits is 116640, while the sum is 41.

Adding to 31356116223161 its reverse (16132261165313), we get a palindrome (47488377388474).

The spelling of 31356116223161 in words is "thirty-one trillion, three hundred fifty-six billion, one hundred sixteen million, two hundred twenty-three thousand, one hundred sixty-one".