20010231161 has 2 divisors, whose sum is σ = 20010231162. Its totient is φ = 20010231160.

The previous prime is 20010231151. The next prime is 20010231211. The reversal of 20010231161 is 16113201002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14900840761 + 5109390400 = 122069^2 + 71480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010231161 is a prime.

It is a super-2 number, since 2×20010231161² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20010231151) 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, 10005115580 + 10005115581.

It is an arithmetic number, because the mean of its divisors is an integer number (10005115581).

Almost surely, 2^20010231161 is an apocalyptic number.

It is an amenable number.

20010231161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010231161 is an equidigital number, since it uses as much as digits as its factorization.

20010231161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20010231161 its reverse (16113201002), we get a palindrome (36123432163).

The spelling of 20010231161 in words is "twenty billion, ten million, two hundred thirty-one thousand, one hundred sixty-one".