2131403646161 has 2 divisors, whose sum is σ = 2131403646162. Its totient is φ = 2131403646160.

The previous prime is 2131403646121. The next prime is 2131403646167. The reversal of 2131403646161 is 1616463041312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1511768611600 + 619635034561 = 1229540^2 + 787169^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131403646161 - 2¹⁴ = 2131403629777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131403646167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065701823080 + 1065701823081.

It is an arithmetic number, because the mean of its divisors is an integer number (1065701823081).

Almost surely, 2^{2131403646161} is an apocalyptic number.

It is an amenable number.

2131403646161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131403646161 is an equidigital number, since it uses as much as digits as its factorization.

2131403646161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

Adding to 2131403646161 its reverse (1616463041312), we get a palindrome (3747866687473).

The spelling of 2131403646161 in words is "two trillion, one hundred thirty-one billion, four hundred three million, six hundred forty-six thousand, one hundred sixty-one".