31354126656161 has 2 divisors, whose sum is σ = 31354126656162. Its totient is φ = 31354126656160.

The previous prime is 31354126656103. The next prime is 31354126656199. The reversal of 31354126656161 is 16165662145313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21293056513600 + 10061070142561 = 4614440^2 + 3171919^2 .

It is an emirp because it is prime and its reverse (16165662145313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31354126656161 is a prime.

It is a super-2 number, since 2×31354126656161² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31354126656101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15677063328080 + 15677063328081.

It is an arithmetic number, because the mean of its divisors is an integer number (15677063328081).

Almost surely, 2^{31354126656161} is an apocalyptic number.

It is an amenable number.

31354126656161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31354126656161 is an equidigital number, since it uses as much as digits as its factorization.

31354126656161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 50.

The spelling of 31354126656161 in words is "thirty-one trillion, three hundred fifty-four billion, one hundred twenty-six million, six hundred fifty-six thousand, one hundred sixty-one".