161401813241 has 2 divisors, whose sum is σ = 161401813242. Its totient is φ = 161401813240.

The previous prime is 161401813217. The next prime is 161401813319. The reversal of 161401813241 is 142318104161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158102459641 + 3299353600 = 397621^2 + 57440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161401813241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161401813198 and 161401813207.

It is not a weakly prime, because it can be changed into another prime (161401893241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80700906620 + 80700906621.

It is an arithmetic number, because the mean of its divisors is an integer number (80700906621).

Almost surely, 2^161401813241 is an apocalyptic number.

It is an amenable number.

161401813241 is a deficient number, since it is larger than the sum of its proper divisors (1).

161401813241 is an equidigital number, since it uses as much as digits as its factorization.

161401813241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 161401813241 in words is "one hundred sixty-one billion, four hundred one million, eight hundred thirteen thousand, two hundred forty-one".